In the SanKen data sheet for an Off-Line PWM Controller (found ) they use, in several places, a schematic symbol for an electrolytic capacitor that I haven't seen before (see C6 in the image below).    The image was taken from Chapter 12. Reference Design of Power Supply. And from the Bill of Materials they list "C6 Electrolytic 22 μF, 50V".  What is the meaning / significance of the the three slanted lines on the capacitor symbol?
I am looking at  (dual low-voltage power amplifier). On the fourth page, there is a sample circuit; right at the V+ input there is a symbol that looks like a capacitor. However, it looks like it is shaded in. What is that?
Recommendations for good Newtonian mechanics and kinematics books Citation colour with Beamer + Hyperref + Natbib I'm using natbib for citation with a custom bibstyle. I'm working on a presentation using LaTeX beamer and for some reason the citation marker doesn't have the colour that is specified to hyperref. The citation marker is black instead of green. I'll give you a MWE:    \documentclass{beamer} \hypersetup{   colorlinks,   citecolor=green,   linkcolor=red }  \usepackage{filecontents} \begin{filecontents}{mybib.bib} @ARTICLE{Bar2011,   author = {F. Foo and F. Bar},   title = {Foo and Bar},   journal = {Journal of Foo},   year = {2011},   volume = {1},   pages = {1--3} } \end{filecontents}  \usepackage[comma,numbers,sort&amp;compress]{natbib} \bibliographystyle{plain}  \begin{document} Dummy referefence to~\cite{Bar2011} \bibliography{mybib} \end{document}   For the purpose of the MWE I have selected the plain bibstyle, however, changing that to something else (including the custom style I want to use) doesn't affect the label colour.    Is there any patch for this problem? When did you wake up?      I woke up at 10.   But then if I say, “When did you sleep?”     I slept at 10. – seems difficult to digest!   That's because sleep is a process that includes duration.     I slept for 10 hours. – this way, it's digestible!   But when I mention the point of time, is it okay?   Strange thing is, if I'm describing my habit/routine, it's perfectly fine..     I sleep at/by 10     I request not to take this question 'logically'. It's about English. Nobody is perfect in timing. Please don't argue that you cannot have 'perfect time' of sleeping because you don't know when you slept. I'm talking about the sentence structure and not precise timings.   By the way, “I slept at 10” is very common in India. Why do Unix man pages use double backticks in place of double quotes? I've noticed that man pages and other documents formatted by Unix utilities often use double backticks `` followed by double single quotes '' to wrap quoted phrases instead of the double quote character ". Single quotes are similarly replaced. Why is this?  Here are a couple examples, from the man page for grep:   To find all occurrences of the pattern `.Pp' at the beginning of a line:         $ grep '^\.Pp' myfile   The apostrophes ensure the entire expression is evaluated by grep instead  of by the user's shell.  The caret `^' matches the null string at the  beginning of a line, and the `\' escapes the `.', which would otherwise match  any character.   The grep utility is compliant with the IEEE Std 1003.1-2008 (``POSIX.1'')  specification. Plot electric potential and field I wanted a list of sub-domains of Stack Exchange that are not mentioned over here   Some of the sub-domains I found which were not mentioned are       Are there any other which are not mentioned?    Mentions by , ,             Other mentions below which are not mentioned in "All Sites" but are mentioned in the drop down menu on the top left of the Stack Exchange website         Any other website that's left out ? Parse HTML in Android I understand that the Announcer badge can be earned if the question is visited 25 times.  But is this only when I share a link to this question in one of my answers, or can I also share the link (with my user id somewhere to count the accesses) somewhere else, maybe Facebook? Why can't I use Stack Exchange if I'm under 13 years old, or if I'm under 16 years old and from the EU? I was just reading the , and noticed something:  You must be at least 13 years old to access or use the Network or Services, including without limitation to complete a Stack Overflow account registration. By accessing or using the Services or the Network in any manner, you represent and warrant that you are at least 13 years of age. If you are under 13 years old, you may not, under any circumstances or for any reason, access or use the Services or Network in any manner, and may not provide any personal information to or on the Services or Network (including, for example, a name, address, telephone number or email address). If you are located within the European Union, you must be at least 16 years old to access or use the Network or Services, including without limitation to complete a Stack Overflow Account Registration.  I signed up for Stack Overflow when I was around 11 or 12 and I did provide my email address. Are you saying that my use of Stack Overflow was not legal? I'm 16 now (so I'm in the clear), but that just seems a little harsh. Is that possibly related to the age limit for accepting a binding contract/agreement (although I thought that was 18 in the U.S.)? Is there a way for users under the age of 13, or for users from the European Union who are under the age of 16, to use the site legally? Dell Vostro 5490 no WIFI in Ubuntu 18.04 Delaunay triangulation to generate abstract networks and nodes Is it possible to use Delaunay triangulation to generate an image like the below from a raster or vector of an object (in this case, a human heart)? What software and techniques would be required to make something like this? My intention is to make and use something like this in Inkscape without having to draw all the nodes/lines/effects manually. Understanding dummy (manual or automated) variable creation in GLM If a factor variable (e.g. gender with levels M and F) is used in the glm formula, dummy variable(s) are created, and can be found in the glm model summary along with their associated coefficients (e.g. genderM)  If, instead of relying on R to split up the factor in this way, the factor is encoded in a series of numeric 0/1 variables (e.g. genderM (1 for M, 0 for F), genderF (1 for F, 0 for M) and these variables are then used as numeric variables in the glm formula, would the coefficient result be any different?  Basically the question is: does R use a different coefficient calculation when working with factor variables versus numeric variables?  Follow-up question (possibly answered by the above): besides just the efficiency of letting R create dummy variables, is there any problem with re-coding factors as a series of numeric 0,1 variables and using those in the model instead? Root of continuous function using Rolle's Theorem $$f(x)= 1 + e^x\cos(x)$$   $$g(x)= 1 + e^x\sin(x)$$      Show that there is at least one root of $g$ between two roots of $f$   How do I start to answer this question and do I need to use Intermediate Value Theorem? I define a shell keybinding in my ~/.bashrc like so:  bind -x '"\e\C-w":"/usr/bin/reset"'   This does make Ctrl-Alt-w launch the reset executable. However, it leaves the terminal in a state that resembles the one you get into by pressing Ctrl-v. So, for example, if immediately after resetting in this way I press Ctrl-p, instead of invoking the action of that shortcut (repeat previous command) I get ^P printed.  Any idea what's causing this problem and how to fix it?  EDIT: I am attaching a Python program that reproduces the messed-up terminal state I am trying to fix with the reset. I encounter this condition very often while debugging multi-threaded applications:  import pdb, thread, time  def interrupt():     time.sleep(2)     pdb.set_trace()  thread.start_new_thread(interrupt, ()) raw_input('? ')   To reproduce the messed-up state, just run the code above, and press Enter when you see the debugger invoked (it will print a bunch of text, ending with pdb.set_trace(), about two seconds after you run the program and the initial prompt appears). Looking for a sci-fi movie in which a human astronaut befriends an alien on a reddish planet This probably wasn't a blockbuster back in its time as I remember the special effects didn't seem all that bombastic, but I do remember a few details.  A human astronaut lands (or crash-lands) on a prominently reddish planet. It might have been Mars, thought it might not have been. I think the atmosphere on said planet was humanly breathable (as in the astronaut does not wear his helmet).  This human astronaut needs to survive. He spots a humanoid alien, apparently also having crash-landed or otherwise in need of survival. He sees this alien consume some sort of greenish orb, apparently for nourishment. He sneaks up to the alien (or the alien craft) in an attempt to grab some of those greenish orbs. I don't remember whether he succeeds, but he does get beaten up by the alien.  The next bit of detail I remember was the human astronaut constructing some sort of shelter to protect both him and the alien from... meteor showers? The human astronaut piles up some rocks to build a hut while the alien, apparently having learned a few English words, says "shiiiiit" and "no solid". The human astronaut asks, incredulous, "No solid?" and punches the hut he just build. "See? Solid!" he proclaims, while the hut collapses a few seconds later. The alien laughs.  Later on the human astronaut is either caught by or accidentally fell into some sort of mouth-in-the-sand creature. He is saved by the alien in the process (or was it the alien who fell into the mouth-creature and was saved by the human astronaut). They witness the mouth-creature spitting out a turtle-like shell (from another local wildlife) of some sort. The human astronaut observes, and I paraphrase, "This stuff must be so tough that even [the mouth-creature] cannot digest it!" He then proceeds to build a meteor shelter from collected shells.  The last bit of detail I remember is when the alien becomes pregnant and is dying. The human astronaut, having thoroughly befriended the alien at this point, asks (and I paraphrase), "What do you mean you're pregnant? Aren't you a male?" to which the alien responds (and again I paraphrase), "For us it comes naturally, unlike for you humans whose pregnancy only comes after a brief period of pleasure". The alien then asks the human astronaut to bring the child to the alien's home planet and recite the names of the child's ancestors in front of... alien rulers, I guess. The last scene of the movie is of the human astronaut, having arrived at the alien's home planet, standing side-by-side (or perhaps hand-in-hand) with the alien child while chanting in an alien language (what I presume to be the names of the child's ancestors). How do I make ditto marks? How to access specific raw data on disk from java What does this mean? "Your UK visa application has been issued" Your UK visa application has been issued.      PLEASE DO NOT GO TO THE VISA APPLICATION CENTRE BEFORE THEY CONTACT YOU.      You will be contacted by the Visa Application Centre when your documents are ready for collection, or have been dispatched via courier where this is relevant.       You are reminded that you should avoid making travel plans until you have collected your passport, as the outcome of your visa application is not final until you receive your passport.      Please ensure you check the details on your visa when collecting your passport. If you need to contact us you can do so via our International Enquiry Service at www.gov.uk/contact-ukvi-outside-uk      Kind regards,      UK Visas and Immigration   British Embassy Abu Dhabi     Your UK visa application has been issued.   I know words like processed, forwarded, received, refused but never heard anything like that, so I am confused. How can I downgrade a package to an older version via apt-get?  Other tools are also acceptable but apt-get is preferred. Famous puzzle: Girl/Boy proportion problem (Sum of infinite series)