On a planet similar to earth, is is possible for all living creature to have bioluminescence. if yes what purpose would it have to fulfill? what kind of evolutionary trait would be useful in those environment? larger eyes? bioluminescence camouflage? seasonal bioluminescence? communication? what...

I have been making some high voltage projects lately, such as a spark gap tesla coil, slayer exciter, and a flyback transformer HV supply. The flyback transformer uses a single transistor circuit, just like the slayer exciter circuit. I know that solid state tesla coils use a pair of transistors ...

I'm new to C++ and decided to implement a simple program that checks if a string is a pangram (i.e. the string contains all the English alphabet letters). It's my first program in C++ and I have some background with interpreted programming languages like Python and R. I want to know what are the ...

I have a large list list of integer polynomials, all of which are the output of Factor. So my list looks something like this: {... x^2 + 1, (-1 + x)(x^2 + x + 1) ...} Now I want to do further analysis of the reducible elements of list. The problem is that I do not want to check each polynomial ag...

I've seen in many reference designs capacitors that were referred to as "placeholder" capacitors. what are these capacitors exactly needed for? for example, in DDR4 SODIMM Design:

So the premise is that life under the sea and life on the ground has evolved independently and achieved sentience. Finally, the land creatures (I'm using humans for now because of simplicity, I'm still working on this) reach a level of technological sophistication where they can travel underwater...

im doing an audio plugin. We want to do the GUI in perspective. Here is a sloppy example for getting the point across: In this view, the knobs have perspective. This is how we would like it to appear in the plugin. My question is, is it possible to somehow render the knob filmstrips and have the...

I have a language-learning app that shows the user a sentence with an extraneous word added that doesn't make sense in the context, and they have to choose which word doesn't belong: When they tap a word, it marks it with a red X, indicating this is the one that they chose as incorrect. One use...

Sheldon Brown's site suggests that QR skewers should be installed with the levers on the left side of the bike, "so the derailer [sic] doesn't interfere with it" and that "Usually, the lever for the front wheel also is on the left side, but some Bike Friday travel bicycles fold more easily if the...

I have seen Apex Promises, Apex libraries to chain Queueables, read about Continuations but I am still unsure what is the best solution for: run multiple long-running callouts Sequentially (wait for previous to complete) Stop or decide on how to cope with errors in 2021. I am looking for a solu...

I noticed one time when I was playing Super Mario Bros 1, I hit a block containing a fire flower, but then got hit, and yet the fire flower is still on-screen. When I touched the fire flower, as Small Mario, it just turned me into plain Super Mario instead of Fire Mario. Is this a bug? Or is it n...

I wake up after an indeterminate period of hibernation. I'm in the dark deep space. No reference at all. I don't ear the hum of the engines. I can't know whether my starship moves inertially or it has been trapped by some force-field and been fully stopped. The radar is warning about a collison. ...

I have this circuit. The goal is that it going to control the current loop by using the NPN-transistor. My problem here is that 0V results that the output from the Op-amp is near 24V. Why? If I'm increasing the voltage a little bit, then I got this. And even better, If I implement a schottky di...

I was wondering how high the DJI Mavic Mini could fly before the air became too thin. I know that there are restrictions in the app (and probably in the drone/controller itself) but if you were able to override those things, how high would it go (not including battery life)? Thanks in advance!

Mazer Rackham says “There is no teacher but the enemy. No one but the enemy will tell you what the enemy is going to do. No one but the enemy will ever teach you how to destroy and conquer. Only the enemy shows you where you are weak. Only the enemy shows you where he is strong. And the rules of...

The wikipedia entry for "Primum non nocere" mentions that it's sometimes written as "Primum nil nocere". I realize the shade of difference is probably pretty fine, but is one of these more correct?

I have the following minimum working example: \documentclass{article} \begin{document} \begin{table}[!ht] \centering \begin{tabular}{|c|c|} \hline a & b & c \\ \hline 0.1 & 9 \\ \hline 0.5 & 4 \\ \hline 0.9 & 12 \\ \hline \end{tabular} \end{table} \end{document} Now I want cells to be color...

I followed some advice I found here for a replacement for Disk Inventory X OSX disk space shows 200GB as "other" I installed the DaisyDisk app and it worked very well, however now my machine is constantly overheating and mds_stores is consuming 99% of the cpu. DaisyDisk does not appear in the App...

I was doing a monster battle with some of my friends and there were two aboleths, aboleth #1 and aboleth #2. Aboleth 1 had a werewolf under control using their enslave power, and then aboleth 2 took control of aboleth 1. Can aboleth 2 now control the werewolf under aboleth 1's control?

Supply curves are usually non decreasing. For example in a electricity market, providing more capacity means turning on new production units with higher costs, see e.g. the following representation: My question is, in what context would it make sense to have a non monotonic supply curve?

In several scenes of season 2 of The Mandalorian, the titular character uses a tiny telescope (possibly a rifle scope?) to look at certain objects, such as a gigantic dragon which is so close there's no conceivable reason to need magnification. This scope looks like it's about an inch in diamete...

I would like to know how to make geometric symbols denoting lines, line segments, rays, arcs, or circles. This is what they should look like. I have tried symbol searching things like DeTextify, but it can't find symbols that attach to other letters.

In New York, USA, If I go to my doctor's office and request that they order a specific blood test for me, can they refuse? Is there anything in HIPAA (or other laws) that compels a medical professional to order a test that has been requested by their patient?

I'm a physicist studying differential geometry for my GR research, and I come up with the following claim (not sure if it's true or not): For any compact surface $S$ that's not homeomorphic to a sphere, $S$ must have a point with vanishing mean curvature, i.e $H=0$ Is this claim true or not? I kn...

So I am working on a project that involves me to check real time difference between samples.I am fairly new to this so after a bit of researching I wrote a simple python script for it, here is the script. Here is the script: import time from rtlsdr import RtlSdr sdr = RtlSdr() sdr.sample_rate = ...

Is this sentence correct? This is John's car, a friend of mine. Or do I need to say This is John, my friend's car.

Nowadays deck can be used to refer to a set of slides (e.g., PowerPoint slides). Where does that sense come from? https://www.etymonline.com/word/deck didn't yield any insight on it.

I'm trying to make a "main effect" type chart but I haven't found a way to do it in Mathematica. The main effect plots are the graphs plotting the means for each value of a categorical variable, ploted side by side. Example as follows. Dataset: Bucket = {{24, 48}, {28, 53}} Nozzle = {{1, 42}, {2,...

I inserted a graphic in an enumerated list and I am trying to make it as wide as the line width of the enumerated list. If I use the command width=\linewidth, width=\textwidth, or width=\columnwidth it makes it as wide as the line width of the document. I have illustrated this by drawing red line...

I'm working on an embedded system which will generate data at a pretty high rate, 100-300Mbit/s. This is coming from a bunch of SPI busses. I need to get this into a Linux PC. What's the best way to do that? At the moment I have a small portion of this built with a STM32F4 microcontroller as pr...

How unsafe would be to publish the hash of my passwords? I have written a Python script for helping me to remember my basic passwords (computer password, encrypted backup password, AppleID password, and KeyChain password). It is hardcoded inside this: SHA256(MD5(password) + password + MD5(passwor...

This question has a similar title, but my question is different. I would like to denote the kth exterior power similar to this: \wedge is too small and \bigwedge is not only too big, but it also centered in a strange way: Also, I don't like using \Lambda instead. I tried the "relsize" package, ...

The doctrine of the intercession of saints states that deceased saints can be asked (via prayer) to intercede for the living. This assumes that there is: A living Christian. A deceased saint. A one-way communication from the living Christian to the deceased saint. (*) A two-way communication bet...

I am trying to develop story about the colonization of Jupiter's moons. Io is assumed to have a background radiation of roughly 3600 dayrems. I would guess that other factors such as lunar orientation and elevation could impact this, but let's assume it is a good estimate. I've looked at several...

I have a library of biological implementations (i.e. plasmids) of genetic circuits and their experimental data associated. I want to implement an in silico version with SBOL, but to be consistent with what I have I'm my freezer, I need to identify not only the genetic circuit but also the biologi...

I'm working through the exercises in this Logic problem set and I'm struggling to understand ex. 7.5: Determine whether the following sentence is logically true in predicate logic: There is someone such that, if he or she is asleep, everyone is asleep. The solutions section suggests this is T...

Say I have $$\lim_{h\to0} \frac{e^h-1}{h}$$ If $$\frac{d}{dx}(e^x)|_{x=0} = \lim_{h\to0} \frac{e^{0+h}-e^0}{h},$$ how would I “back engineer” the derivative limit definition to satisfy the expression meaning expression 1 equals expression 2. But we’re only given expression 2 the limit expression ...

How to delete from all .asc files in the directory the lines containing '=' and 'HISTORY' (which is always capitalized) and all empty lines? I think it will be something like: for file in /media/linux/DATADISK/*.asc do sed '/=/d' sed '/HISTORY/d' done

I read it in the 80's. Cover had a person in a spacesuit standing in a river of lava. On the shore was some sort of alien critter(s). Think perhaps this was inside a cave? Premise of the book was a group of people were decimating planets for some unknown reason. Main character (?Bron?) was "i...

The definition of an isomorphism is "a structure-preserving mapping between two structures of the same type that can be reversed by an inverse mapping". In my linear algebra class, an isomorphism is defined as "a bijective linear transformation." I understand some of the structure that is preserv...

(NO CIA/FBI/NSA IM NOT A TERRORIST ARMED WITH 250 STOLEN/UNACCOUNTED FOR NUKES) I’m writing a Godzilla fanfiction and in it, while Godzilla was doing Godzilla things on the West Coast (destroying cities, fighting and brutally killing other Kaiju, forcing humanity towards extinction, etc.), the US...

I have the next sequence queue: $\sum_{n=1}^{\infty}{\frac{n^2-n-1}{n^4+n^2+1}}$. Does the queue converges or diverge? My attempt: I have tried to show that $\frac{1}{n^2}>|\frac{n^2-n-1}{n^4+n^2+1}|$ for any $n>0$, and then by the comparation test we get that since $\sum_{n=1}^{\infty}{\frac{1}...

$$\Large \int_{0}^{\infty} \left (\frac{1}{ \sum_{k=0}^{\infty} x^k} \right)~ dx$$ It seems like this converges to $\approx \frac{1}{2}$ but when I try to calculate this I get really stuck, and for no reason! $$ \sum_{k=0}^{\infty} x^k = \frac{1}{1-x} $$ And so the integral becomes: $$\large \int...

How you can get the first three parts from MAC address? $ mac=11:22:33:44:55:66 $ vendor=${${mac//:/}:0:6} bash: ${${mac//:/}:0:6}: bad substitution ${mac//:/} removes : and :0:6 should get the first 6 characters? or other way around: vendor=${${mac:0:8}//:/} bash: ${${mac:0:8}//:/}: bad substit...

I have many things to do during my day (work + study + projects + ... + ...) and seriously 24 hours a day is not enough to finish my tasks. I know that by Einstein's theories that time gets slower if travel fast. So I decided to travel fast ( not to the speed of light, but a closer speed maybe) A...

I am learning Modern Greek on Duolingo, in the hopes that it will help me learn Koine and Ancient Greek, eventually. I have also watched a few other videos, like this one: https://www.youtube.com/watch?v=6Xy7WahsS7I It is mentioned that "μπ" and "ντ" are usually indicators of needing to represent...

I'm trying to understand the concept of permutations being decomposed into transpositions in group theory. In Pinter's Book of Abstract Algebra pg. 83, he says $(12345) = (54)(53)(52)(51)$ I just can't make any sense of this. The permutation $(12345)$ is the identity, right? So if I apply those t...

For any topological space $A$, the cone $C(A)$ is defined to be $A \times [0,\infty)$ with $A \times 0$ identified to a point (cone point). Let $X$ and $Y$ be two compact Hausdorff spaces such that there is a homeomorphism between $C(X)$ and $C(Y)$ which preserves the cone points. Can we prove th...

There are four 12-hour clocks arranged in a 2x2 grid, as shown in the diagram. The long minute handles of the left two clocks are touching, while the others are not. Two minute handles touch if they are both vertical (0 and 30 minutes) or both horizontal (15 and 45 minutes). You can set the time ...

I am a high-school Senior who will not earn enough income working this summer to have to pay income taxes. I have a full ride to college, so I was thinking of using my earnings/savings for retirement. Does putting my earnings in a Roth IRA mean that I wouldn't be paying taxes on those savings at ...

According to this page, the Apple 1 monitor program was located in addresses $F000-$FFFF, a ROM program to use the optional cassette interface card was at addresses $C100-$C1FF, and the peripheral address for writing to the cassette was at $C028. The most likely explanation is that the address ra...

I've configured a WMS service on QGIS Server by using https://docs.qgis.org/3.16/en/docs/training_manual/qgis_server/wms.html and QGIS Server on a Windows machine -where do the qgs files go? but was trying to see how I can also serve WFS. When I try 'http://localhost:8080/cgi-bin/qgis_mapserv.fcg...

I am trying to find a proof of the following fact: Let $M$ be a real symmetric matrix, then the largest singular value satisfies: $$ \sigma_1(M) = \lim_{k \to \infty} \left[\text{Trace}(M^{2k})\right]^{\frac{1}{2k}} $$

I wanted to prove the work energy theorem in three dimensions starting from Newton's second law of motion. I am having some trouble understanding differential swapping and deriving the kinetic energy formula in three dimensions. Assuming $F_c$ is the sum of all conservative force and $F_{nc}$ is ...

I was reading this Biblical Unitarian article that explains their views regarding the Holy Spirit. One particular view they hold is the "gift of God's nature" interpretation, according to which the "holy spirit" (lower case) should be understood as some sort of distributable substance. They cite ...

For a wizard, preparing new spells at the end of a long rest seems to require studying their spellbook (emphasis added): You can change your list of prepared spells when you finish a long rest. Preparing a new list of wizard spells requires time spent studying your spellbook and memorizing the i...

I am wondering if there is an easy way to fit an ellipse into an arbitrary 2D image quickly, so its centroid, orientation, major, and minor axis length can directly be extracted. In MATLAB, this can be done using regionprops command quickly as shown in the following URL: https://www.mathworks.com...

To define a (non-indexed) W-type all we need is a type $A:U$ and a function $B:A\to U$ and we get a type $W_{a:A}B(a)$. To check that this definition is valid we only need to check that the definitions of $A$ and $B$ are valid. Now general inductive types seem like very scary beasts and I still d...

I have a function depending r, for example f[r_]:=2*(1/a)Exp[-r/a] I want to plot a r^2 f[r]^2 vs r/a, How to do this? I tried this Plot[a *r^2 *f[r]^2, {r/a, 0, 8}, PlotRange -> All] but it returns $Failed

Will Christ at the second coming be made of flesh? Does any bible passage claim He will be made flesh, as John 1:14 And the Word was made flesh, and dwelt among us

I use the command ls in a terminal. I found this wired file with the prefix ~$. When I was trying to remove it, the terminal responded No such file or directory. I even tried renaming it, but it still showed the same error. How do I successfully remove or file the file?

Let $a$ and $b$ be positive numbers. Prove that: $$\ln\frac{(a+1)^2}{4a}\ln\frac{(b+1)^2}{4b}\geq\ln^2\frac{(a+1)(b+1)}{2(a+b)}.$$ Since the inequality is not changed after replacing $a$ on $\frac{1}{a}$ and $b$ on $\frac{1}{b}$ and $\ln^2\frac{(a+1)(b+1)}{2(a+b)}\geq\ln^2\frac{(a+1)(b+1)}{2(ab...

I have a curve $\gamma=(f(x),g(x))$ parameterized by a real parameter $x > 1$ (one can perform a variable change $y = x^{-1} \in (0, 1)$ if $x\rightarrow\infty$ is problematic), with the functions $f(x)$ and $g(x)$ known. I wish to plot this in 2D using Mathematica, but I don't know how to do it....

Where I work: I work for a large global private company with a Fortune-500 vibe, located somewhere on the East Coast. I work for a division of the company that is highly compensated, and whose employees often come from much leaner companies, with smaller cultures. This is all just to say that whi...

I use an old convection oven. I usually preheat at 180°C for 10 mins. Recently I bought an oven thermometer and found that the oven temperature after the said duration was higher than 180°C, around 210°C-220°C. Is this normal?

ISCKON is a sect of Hinduism who worship lord Krishna. They accept Bhagavata Puran and Gita(to my current knowledge). Do they accept the authority of vedas above gita?

Acts 2:42 "And they continued stedfastly in the apostles' doctrine and fellowship, and in breaking of bread, and in prayers." My question is what exactly was the "Apostles' Doctrine" according to the Apostles who were present during the moment when the Holy Spirit filled the house?

I'm starting a new project after 3 years of software & AI development in the same company & department. I was initially supposed to develop the software/AI part of the project based on skills, but in a literal last-minute decision, my area of expertise was given to a colleague with more credentia...

Pretty trivial but for a matrix \begin{bmatrix}x&x&\ldots&x&x\\x&x&\ldots&x&x\\\vdots&\vdots&\ddots&x&x\\x&x&\ldots&x&x\end{bmatrix} with $N\times N $, is there is simpler notation. I had $A=[x_{i,j}]\in \Bbb R^{N\times N}$ in my mind, but I can't find anywhere were it is used Edit: I forgot to ...

I submitted a manuscript to a journal one year ago. The journal is well known and has already published papers on the same subject including one of my previous papers. The paper I submitted went under review after two weeks. After eight months, I contacted the journal to inquire about the status ...

I have this toy example, template <typename TChild> struct Base { template <typename T> using Foo = typename TChild::template B<T>; }; struct Child : Base<Child> { template <typename T> using B = T; }; using Bar = Child::Foo<int>; which fails to compile. The intention is that ...

Some yogis of India believe in transcendental state of mind. However I saw no such reference in the teachings of Buddha. So , what is difference between transcendental state of mind and Nirvana? (Assuming Nirvana is the Buddhist state of mind)

In order for magic to manifest in this world, one has to recite a specific incantation following a visualization of the anticipated result then only the magic will occur. Amazingly many students from the special school of the disabilities especially the mutes seemed to be able to perform magic un...

I have some situations where I run async code inside class constructor: 1. Run async code that returns a response I execute some async code that returns a response, then I apply then and catch inside class constructor: class MyClass { constructor( someParameter, anotherParameter, ) {...

I need guidance on removing front wheel of my Merida cx400. I could not find any allen key or quick release provision. Could you anyone please help me with tool set for the same.

Just came across a post from a Jesuit claiming Historical revisionism is one of the worst, and dangerous, mistakes one can make. It appears to be with regards to the latest news of Jesuits in US pledging USD100M in reparations to descendants of slaves. As @MauroALLEGRANZA pointed out in the com...

I have to find the positive range for the derivatives of a lot of functions. I have a very inefficient solution. At the moment I am using a For loop to find the times where the function is positive and use Split as used in #23608 to find the intervals. Full code: f[t_] := Sqrt[0.9604 + 0.0099 (Co...

I've used TI Webench to implement single DC DC converters in a circuit, so I'm always confident in using whatever TI generates for me. But what are some design considerations or modifications required when combining two or more DC DC converters with different rated load? I was thinking this may n...

On a test I had for my Mandarin 1 class, for a certain part of it, the instructions were, " Look at the answers below and write an appropriate question using the V 不 bù / bú V pattern." For one of the questions of that part, the answer was "我很喜欢看法国电影." Since the person in the answer stated that t...

So with the /effect command, it can give either you or a random entity in Minecraft. However, you can actually make custom items in the game with effects when you wear it, here: So I want to make armor with resistance 255 so it would make you immortal, and pls put...

I'm a US extra class, but a little late to the party, so to get a short 1x2 I have to fight it out at the vanity call sign fair. I thought I understood the rules, but apparently I don't. The only chance we have to get a concise 1x2 call sign (or by all means 2x1) is to get one that has been cance...

I have problems with some arrays in bash. A=( "127.0.0.1" "localhost" "aaa nnn cvcc" ) B=( "8.8.8.8" "dns" "bbb tttt rrrr") for n in ${A} ${B} ; do if ping -c3 ${n[0]};then echo "${n[1]}" for share in ${n[2]};do echo $share done fi done I'd like to print the second and thi...

I am a bit confused if it is the Product Owner or the entire Scrum Team? Thank you for your answers

On Ubuntu 18.04.5 LTS (server) with LAMP stack I got a prompt to confirm package degradation: The following packages will be DOWNGRADED: libssl1.1 openssl This two packages are: dpkg --list "libssl*" Desired=Unknown/Install/Remove/Purge/Hold | Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half...

I want to create the CRT refreshing effect as shown in the GIF: Now how do I do that?

My question is about the aesthetics of a certain table and as such is opinion-based and likely to be closed. I am wondering what's the optimal presentation of the following table: \documentclass[]{article} \usepackage{fullpage} \usepackage{booktabs} \begin{document} \begin{table}[ht] \belowcapti...

I have two files which look as follows: file1: 6:66893424_T_C -0.5985 rs151222586 -0.0351 rs12364336 -0.0030 rs57502521 0.0099 file2: 6:66893424_T_C 0.5985 rs151222586 -0.0351 rs12364336 0.003 rs57502521 -0.0099 I would like to: find those lines where column 2 has the same sign (minus ...

I know spin-1/2 Pauli matrices satisfy the anticommutation relationship $\{\sigma_i, \sigma_j\}=2\delta_{ij} \mathbb{I}$. I wonder how this can be proved without writing down the matrix representation of these matrices and performing matrix multiplication. As the matrix representation of angular ...

I've tried this question on two forums and have been told this is the best place for this type of question. I'm trying to print from 0 to 1000 then back to 0 again (and all numbers in-between), printing 1000 only once. Also, each number must be on a separate line using vanilla PHP. My current cod...

I would like to know why if I try to prove with the delta epsilon definition that the limit as $x,y$ tends to $(0,0)$ is $0$ of this function: $$\frac{x^2 +y}{(x^2+y^2)^{0.5}}$$ I get a positive result: for $\delta = \epsilon -1$ I get that $|f(x,y)-0|$ is less than $\epsilon$. But if you evaluat...

When the content of the Email Greeting or the Postal Greeting field is getting too long, CiviCRM is no longer able to edit it through the GUI, what happened since I have activated Smarty and inserted large expressions. I want to have a standard greeting that works for every gender, language and s...

I've recently heard a rhythm that sounded like this It seems slightly tricky to play it perfectly, so I wonder if I could somehow improve this writing to make it more natural and "readable". For example, what if I simply wrote and added some rubato in the last two notes? Could that mimic the fi...

Acts 15:28 (ESV): 28 For it has seemed good to the Holy Spirit and to us to lay on you no greater burden than these requirements: Since the pronoun "us" clearly points to the people at the Jerusalem Council (who were persons capable of having personal opinions), and since the whole phrase is "t...

My question is very simple. I just want to know that is conduction band discrete or continuous?

In America, the police have a reputation for being politically conservative. One rarely sees clashes between conservative demonstrators and police. In Europe, though, there seem to be lots of clashes between anti-lockdown (presumably conservative) and (in France) yellow vests movement protestors ...

How can we prove that $x^n$ isn't divisible by $g(x)=x^4+x+1$ without remainders? I understand why for all $n<4$ it's working, but how with $n \ge 4$? How we can prove it formally? Note: $x^n,\:g\left(x\right)\in \mathbb{Z}_2\left[x\right]$

I'm not a pilot. In the following excellent explanatory video I understand everything except for a single point. The presenter says that in cloud, if the instruments tell the pilot to level the wings when the plane is tilting to the left, the pilot's reaction will be to bank even more steeply to ...

As a security in-charge, I just noticed that one of our web apps got attacked by some hackers, and on the production, server attacker got .git/objects/ files. After that, I add some config in .htaccess and make .git and its content inaccessible. The attacker may get some model file which includes...

I found this sentence in an article about japanese swords 日本刀と他の刀との違いは、どれだけ波紋と鉄が美しいかにこだわっているかです The translation is The difference between japanese swords and other swords is how much the ripples and iron are particular to their beauty But since か is used to carry a sense of questioning should...

I am currently a senior high school, and next year I will enroll for my undergraduate studies but I am afraid that my grades would not be good enough to be admitted in good universities like MIT, Princeton etc. So can I study advanced topics like general relativity, quantum mechanics etc., like ...

I'm trying to translate the following syntax found in tidyverse into base R as a function, though I'm having difficulties following the same output. Here's the syntax: x <- function(x) {x %>% select(where(negate(is.numeric))) %>% map_dfc(~ model.matrix(~ .x -1) %>% as_tib...

I'm using a MAX31865 RTD measurement IC, and a standard PT100 RTD to measure maple syrup temperature as it's boiling (219 degF). At ambient, the temperature measurement is reasonably stable. But, when boiling, I get a substantial amount of drift. I need stability prefereably in the range of +/...

For an embedded application, I'd like to drive a relay using a transistor. At the moment I'm experimenting with a BC547, but only because I've still got some of them lying around. The transistor I am using is rated at a max of 100mA continuous for the collector (or collector-emitter) current (if ...

$$ \int_0^a \frac{dx}{x + \sqrt{a^2 + x^2}} $$ How can this definite integral be evaluated ? Any suggestions ?? The answer is $ \frac{\pi}{4} $ Pic Of Question From Book (B S Grewal)

I was checking the implementation of IndexOutOfBoundsException in JDK 16, and noticed that a new constructor with a long index has been introduced: /** * Constructs a new {@code IndexOutOfBoundsException} class with an * argument indicating the illegal index. * * <p>The index is included in t...

In Ace Ventura: When Nature Calls, Jim Carrey at one point exclaims '"Wunderbar!" he exclaimed with great relish'. Like much of what he says in these early movies, I assume this is a reference to some other media. However, internet searches have turned up empty. A...

In many cases of mathematics, we tend to set several variables in ascending alphabetical order. $x,y,z \dots$ for normal variables $A,B,C\dots$ for sets, coefficients, matrices $V,W\dots$ for vector spaces ${I,J}\dots$ for indices, ideals $\mathcal{C,D}\dots$ for categories But when we need 3 g...

I partitioned an existing table by year. After inserting a new record for a date in 2020, the new record shows as part of the 2020 partition and in the primary filegroup. I'm having a hard time finding if that's what is supposed to happen, or if I have something configured incorrectly. This is wh...

Sputnik 1 (/ˈspʌtnɪk, ˈspʊtnɪk/; "Satellite-1", or "PS-1", Простейший Спутник-1 or Prosteyshiy Sputnik-1, "Elementary Satellite 1") was the first artificial Earth satellite. The Soviet Union launched it into an elliptical low Earth orbit on 4 October 1957. It orbited for three weeks before its ba...

My first language is Russian. I tried to learn American English pronunciation of the word "lee" and other words containing / li / sound, like "delete". When I compared the recording of my voice with the given example of correct pronunciation, they sounded quite different. My pronunciation sounded...

I have reviewed a paper for a journal, which I rejected. I wrote a 3 page report with major and minor comments. A week later, I received an invitation to review the same paper in another journal. The authors have nicely decided to ignore all of my comments, including correcting typos! Is it OK to...

In article 6 of the UN charter it mentions “ A Member of the United Nations which has persistently violated the Principles contained in the present Charter may be expelled from the Organization by the General Assembly upon the recommendation of the Security Council.” It also mentions “recommend...

When I write \frac{1}{f} \frac{1}{\hat{f}} I get the following I would like the two f's to be vertically aligned, but instead the second one dips lower. Is there something like \phantom to put an invisible hat on the first f? In this particular example I could just write \frac{1}{f \hat{f}} wh...

What is the legal term (so that the relevant statute can be looked up) for when someone follows you around with the intent of harassing you and does not maintain 6ft social distancing for coronavirus reasons? References (hyperlinks) to relevant Florida statute is always appreciated.

Creatures with resistances take half the damage from an attack of the type it is resistant to. But what happens if a condition is applied? For example, if someone with poison resistance gets poisoned condition, without any actual damage.

There is a manual for me to learn Junos. you see the external peer configuration, there is no local-address option, but internal has. why eBGP configuration do not need it?

Each column has a group of words with a commonality. I call it 1, 2, 3 words. What are they? 1 2 3 Twitter Parler Facebook Roti Pita Chapati Euro Dollar Pound Two Three Five Poetry Prose Novel Quiet Still Silent

I have a data frame, in which one column is a Series of strings, in which distinct phrases are either single words or multiple words separated by spaces; and the first letter of each individual word is upper case (e.g. "Strawberry" or "Strawberry Jam", respectively). In contrast, if not part of t...

I would like to generate all the tuples of ones and zeros of a given length and with a given number of ones without generating all the possible tuples, which is impossible for tuples of large enough length (but for which the tuples with fixed number of ones is small). For example, if we consider ...