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Swinging Chokes

Autistic 1 hours 28 minutes ago. 1 answers, 0 views switch-mode-power-supply choke
Choke input filters were common on large old 50Hz power supplies .The size of the choke combined with a lack of understanding about distortion factor and cheaper caps favoured the cap input filter which is popular today.Swinging chokes were manufactured...

Consider the weighted Sobolev-type space $$ W_\alpha:=\{f\in L^2(0,\infty):\hbox{id}^\alpha\cdot f'\in L^2(0,\infty)\}. $$ Are there any known embeddings? Ideally, I am looking for an embedding of the above space into $L^p(0,\infty)$ for some $p>2$, some $\alpha_0$, and all $\alpha \in [0,\alpha_0]$. The...

I have the following PowerShell script I am looking to add a header to this results without having a duplicate per each iteration but I am not familiar enough with Powershell if anyone can point me in the right direction...

Finally I got my Hebrew working on LaTeX. Everything's working great except for two issues - numbers and parentheses. Numbers are written the other way around (one hundred would be written 001), and parentheses are reversed too )like this(. Is...

In my room, I have this geeky clock (click for full size): Most of these are not difficult to figure out, but the one for 4-o-clock is particularly tricky: Normally, a fraction like 1/2 doesn't make sense in modular arithmetic...

ORIGINAL QUESTION I want to add a series of dummy variables in a data frame for each value of x in that data frame but containing an NA if another variable is NA. For example, suppose I have the below...

The accepted winner is isaacg, with his 7-bit ASCII answer. However, the challenge isn't over yet - this bounty is awarded to the shortest answer. If, somehow, you get all the first characters of all the other answers down into...

I'm using pdfTeX, Version 3.1415926-1.40.10 (TeX Live 2009) (format=pdflatex 2010.8.30) in TexMaker 2.1 on Mac OSX. I installed the whatever latex packages using the "easier" method at http://guides.macrumors.com/Installing_LaTeX_on_a_Mac - the MacTex batch. I'm outputting some graphs to PDFs in R...

I'm trying to sign data using the WebCrypto API, but instead of creating a private/public key and exporting it to pkcs#1 or 8, I would really like to use a user's PKCS#12 to sign data. I've read the W3C spec,...

I am having a problem reading png images from STDIN using PIL. When the image is written by PIL it is all scrambled, but if I write the file using simple file open, write and close the file is saved...

I was supposed to complete a task and I haven't. This is not the first time. It is entirely my fault and I don't want to avoid responsibility by making excuses, I instead want to own up to my mistakes...

Ever-changing nationalities

jafe 08/21/2018 at 12:37. 3 answers, 89 views riddle knowledge geography history
Make me Portuguese, and I live next door. Make me Spanish, and I live in the same building. Make me British, and I live far away. Make me Dutch, and I live next door from there. Make me French,...

Why does “Krabben” mean shrimp?

Kyralessa 08/21/2018 at 11:33. 1 answers, 613 views meaning
I was in a pizza place in Bad Herrenalb (in Baden-Württemberg) the other day, and I ordered a pizza that included "Krabben". I like crab, so I ordered it, only to find that it came covered with disgusting sea bugs,...

Continent's outermost point

jafe 08/21/2018 at 11:15. 3 answers, 201 views riddle rhyme knowledge geography
I am a continent's outermost point, an island pair by a rough strait made disjoint. Once held by natives, a land owned by right, my population is now mostly white. Named after compass points, "new" just in name, a...

This question already has an answer here: “Trainer” is to “trainee” as “mentor” is to what? 8 answers If FOO is mentor to BAR, what term describes BAR's end of that relationship — specifically as “a person to whom...

Right now, I am generating a random color in pdftex using \definecolor{randomcolor}{RGB} { \pdfuniformdeviate 255, \pdfuniformdeviate 255, \pdfuniformdeviate 255 } Which works pretty well, until I try and compile with luatex. What is the nicest way to generate random colors...

I'm having a hard time fingering A/C# as this sheet suggests: x42220. I've tried: barring with the first finger, but it's difficult for me not to touch the high E. barring with the first finger and muting the high E...

A very well-known aphorism from Antoine de Saint-Exupéry is Il semble que la perfection soit atteinte non quand il n'y a plus rien à ajouter, mais quand il n'y a plus rien à retrancher. (Terre des Hommes, 1939). The canonical...

Please consider the following code: \documentclass[11pt,twoside,openany]{book} \usepackage[svgnames,x11names]{xcolor} \usepackage{wallpaper} \usepackage{changepage} \usepackage[explicit]{titlesec} \usepackage{tikz} \usetikzlibrary{shapes,positioning} \usepackage{lipsum} \usepackage{geometry} \geometry{ paperwidth=216mm, paperheight=303mm, left=23mm, %% or inner=23mm right=18mm, %% or outer=18mm top=23mm, bottom=23mm, headheight=\baselineskip, headsep=7mm, footskip=7mm } %% Command to hold chapter illustration image \newcommand\chapterillustration{} %%...

Importing CSV file to create point layer

ps1 08/21/2018 at 09:42. 3 answers, 89 views qgis python pyqgis csv
I have a CSV file with following fields: Nodename Nodeid Latitude Longtitude Elevation I am using Python console in QGIS to automate this. How should I write so that point with latitude, longtitude and elevation are maked as point layer?...

To working my static file (CSS, JS) I have to write absolute path like /AppName/templates/style/main.css. Is there any solution, that I could write relative path like style/main.css?

A short rebus comes here

filip 08/21/2018 at 09:30. 3 answers, 90 views rebus
Here is a short rebus that I just created. Let's see if you can solve it. Hint it is an old proverb

Unsolved Maths Problems as Puzzles

MikeS159 08/21/2018 at 09:14. 4 answers, 436 views mathematics
On an internal wiki at work, people sometime post puzzles similar to those found on this website. Most of the questions are formulated as a story or word problems, but can be expressed mathematically and become simple to solve. I...

Who killed the husband?

rsp 08/21/2018 at 08:35. 8 answers, 1.298 views logical-deduction mystery
There is a round house with only one room. There is a maid who does everything, a butler who usually gets the mail, an annoying husband, and a lazy wife in the house. The husband is murdered on a...

I'm trying to calling a Java RESTful service by an html page, but I always get errors like the below: No 'Access-Control-Allow-Origin' header is present on the requested resource", 405 (Method Not Allowed) My simplest Java code is: @SuppressWarnings({ "unchecked",...

why is it illegal to castle with both hands?

RuhanUR 08/21/2018 at 08:16. 3 answers, 477 views castling
Guys so i was watching the match between Ian Nepomniatchi vs Hikaru Nakamura. There Nakamura used both hands to castle. why is it illegal to use both hands? What's wrong with that? The match that i saw was this one...

I am trying to play with Tikz, to create standalone figures, with the snippet below: \documentclass{standalone} \usepackage[utf8]{inputenc} \usepackage{tikz} \begin{document} \definecolor{cff0000}{RGB}{255,0,0} \begin{tikzpicture}[y=0.80pt, x=0.80pt, yscale=-1.000000, xscale=1.000000, inner sep=0pt, outer sep=0pt] \path[fill=cff0000,nonzero rule,line width=0.056pt] (50.4060,155.6110) .. controls (52.4160,150.8598) and (53.9892,145.9526) .. (55.4555,141.0119) .....

I have a lot of files named like this: DOS1, DOS2, DOS3, DOS4, ..., DOS128. Each file contains four columns (first column is the same) with numbers, like this: DOS1 is: 33 12 1 2 16 32 8 1 9...

If I run a command in bash, is there any way to determine which files and directories were modified as a result of running that command? For example, if i run: export $MYDIR="/home/users/myuser/" touch $MY_DIR/* I would like to be...

Another Rebus Puzzle By Me!

Kevin L 08/21/2018 at 05:28. 2 answers, 45 views rebus
Just gonna make another Rebus Puzzle :) Looking for a phrase here!

Very briefly, I've been asked to sign a document stating I will repay the cost of a training course if I leave the company in the year following it. Am I being unreasonable to refuse to sign the agreement? And...

What antivirus programs are available for Ubuntu? We previously used Symantec Endpoint Protection but it does not work in Ubuntu.

The proof: Let $\alpha= \sup X$. If $f$ is a bijective mapping of $\alpha$ onto some $\beta < \alpha$, let $\kappa \in X$ be such that $\beta < \kappa \le \alpha$. Then $|\kappa|=|\{f(\xi): \xi < \kappa\}| \le \beta$, a contradiction....

I'm trialling Ordnance Survey OpenSpace Pro WMS, and I have a basic map showing all the layers I'm going to be licensed for (free ones plus vector map local). This works fine, but I'd like to make the most zoomed...

I would like someone to translate the writing on this plate in to english please

Should I drive or bike to work

user39045 08/21/2018 at 03:53. 9 answers, 2.107 views commuter commuting-bike
I'm going to start a job next summer as a sailing instructor, I've volunteered before and biked the 3.6 mi commute a few times a day on a mountain bike I found trashed a year prior. I'm thinking because I'll...

I'm attempting to extract the contents of some files by alphabetical (which in this case also means date and iteration) order and when I test the process first with ls: $ find /opt/minecraft/wonders/logs/ -name 20* -type f -mtime -3 -print0...

Last year, there was news circulating that the US may start having immigration checks for non-US citizens/residents leaving the US. However, a friend told me that the CBP still has no exit control policy. A friend of mine also informed...

The humanoid in question is the following object: It's basically a straw man used to scare crow. So I think both straw man and scarecrow are valid names for it. However, the dictionary says straw man also has another meaning:...

Show that the ring of polynomials with coefficients in a field, and in infinitely many variables, is not Noetherian, that is, $R = k [x_i: i\geq1]$ is not Noetherian. I know that I need to exhibit an ideal of the...

Cannot Start SQL Server 2017?

din 08/21/2018 at 02:34. 1 answers, 162 views sql-server sql sql-server-2017
I have been trying to start SQL Server 2017 and been getting 'Not enough storage is available to complete this operation. ' Full Error: TDSSNIClient initialization failed with error 0xe, status code 0x1. Reason: Error: 19101, Severity: -1, State: 0....

http://www.chioka.in/differences-between-l1-and-l2-as-loss-function-and-regularization/ If you look at the top of this post, the writer mentions that L2 norm has a unique solution and L1 norm has possibly many solutions. I understand this in terms of regularization, but not in terms of using...

I am trying to improve the quality of my code as well as trying to study the Heap data structure. I have implemented a minHeap (Heap in which minimum value nodes have higher priority). Ref: link1, link2, link3. This is...

My wife and I are going to Rome in October and we wanted to get tickets in advance for a general audience with the Pope. I printed the forms found here: http://www.vatican.va/various/prefettura/index_en.html and sent them to the address listed on...

So, this story takes place in the UFS fascist state, in North America. The government is extremely strict on its citizens, and everything the fallen, antiquated United States Of America held dear was erased since the revolution of the 1930s....

I am given to believe that random number generators (RNGs) should only be seeded once to ensure that the distribution of results is as intended. I am writing a Monte Carlo simulation in C++ which consists of a main function...

I have a friend and who is currently playing under a GM that cheats in the players’ favour: uses poor enemy tactics, will not use enemies abilities correctly, generally keeps enemies from finishing off player characters and when they do...

I have 6 and they all show the same stunted growth on some branches. The first photo shows the weigela that shows the most deformity. Thanks for any help!

Using “of all days”

Jeannie yesterday at 19:59. 1 answers, 0 views grammar
Is this grammatically correct? It began on Sunday, of all days. Or is a comma unneeded? Otherwise, it would be: It began on Sunday of all days. Which would make it sound a bit awkward due to the absence of...

Recently, I've measured the CO2 concentration during multiple nights and the levels in the bedroom where I sleep are very high and unhealthy (over 1600 ppm). The problem is that during the summer, the temperatures outdoor are over 95 F...

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