Windows 10 boot ignores grub
Windows 10 upgrade kills grub and boot-repair doesn't help
Non-interleaved vertex buffers DirectX11 Reflectivity of a glowing-hot metal surface When a polished piece of metal (or steel in particular) is heated to incandescence, how do its reflective properties change?  Given a mirror-like surface, would the object temporarily cease to act like a mirror at a certain temperature?  Would the specular reflection of light turn into diffuse reflection; in other words, would the surface temporarily become matte/dull?  I am not asking about permanent changes to the object such as melting, but rather can there be a temporary change in the reflectivity only while the the object is hot, that disappears when the object is cooled down?  Background of the question: I have a laser scanner that usually has trouble scanning shiny surfaces with high specular/ low diffuse reflectivity; and it seems to work a lot better for hot steel pieces than for cold ones. Glowing steel also looks less shiny to me than cold steel, but of course that is hard to tell with all the glowing Derivation of Kepler's laws The  gives the recoil force, $\mathbf{F_{rad}}$, back on a charged particle $q$ when it emits electromagnetic radiation. It is given by:  $$\mathbf{F_{rad}} = \frac{q^2}{6\pi \epsilon_0 c^3}\mathbf{\dot{a}},$$  where $\mathbf{\dot{a}}$ is the rate of change of acceleration.  If a particle has a constant acceleration, $\mathbf{\dot{a}}=0$, then there is no reaction force acting on it. Therefore the particle does not lose energy.   Does this mean that a constantly accelerating charged particle does not emit electromagnetic radiation? How to disable Windows 10 system log In Windows 10 Resource Monitor I found that the system process is constantly writing C:\ProgramData\Microsoft\Windows\wfp\wfpdiag.etl at like 30-100KB/s. This equals 1TB write/year which is not healthy for SSD. There are other log write like C:\Windows\System32\LogFiles*** too.   Although logs is needed for diagnostics, it's better to be turned on only when problem has already occured.  Is it possible to disable as much system logs as possible to decrease garbage write amoung to SSD? Consider a hypothetical situation: In which a time traveler travels in a spaceplane at close to speed of light circling the earth and I get a live telecast of inside of that plane to my television. How time dilation will effect him and what will I observe sitting next to the tv seeing him live. Considering time runs slower at speed of light, will he be looking like a slow motion video? (Or let he also watching live streaming of us at earth, what it will look to him) P.S. I'm not sure if it even makes some sense but if it does kindly explain in logical details. Sorry for the the bad english, I'm not a native speaker. What is "function*" in JavaScript? I'd love your help with finding the sign of the following integral: $\int_{0}^{2 \pi}\frac{\sin x}{x} dx$,I know that computing it is impossible.  I tried to use integration by parts and maybe to learn about the sign of each part and conclude something but It didn't work for me.  Any suggestions? I'm having trouble restarting a 2D game when the user presses the "New Game" button.  Structure of my game:  The game has several 'screens': Opening screen, instructions screen, main game screen, and a game-over screen.  Each screen is an instance of a class: OpeningScreen class, GameScreen class, etc.  There is a class named Main. This class has three roles.   It's the JFrame (the window) of the program. It has the main method - first class to run. It has a method that change's screens.   When the program starts, this class runs. When it first runs:   Creates a new instance of itself (it's a JFrame-type class). Creates an instance of every 'screen-class'. The constructor of each 'screen-class' takes the instance of Main as an argument: (aka: GameOverScreen gameOverScreen = new GameOver(this)). Creates a new JPanel named mainPanel, and adds it to the JFrame. Any screen to be displayed will be contained in this JPanel (The screens are also JPanel-type classes).   How the changeScreen() method works:  The signature of changeScreen() is this: changeScreen(JPanel from, JPanel to).  Whenever a screen needs to be changed, the current screen that is displayed calls this method, like so: main.changeScreen(this, main.InstructionsScreen). It removes the previous screen from mainPanel and adds the new screen to mainPanel. As said, these screens are created when the program launches.  This is the method that changes screens:   public void changeScreen(JPanel from, JPanel to){      mainPanel.remove(from);     mainPanel.add(to);      mainPanel.revalidate();     mainPanel.repaint();  }   My problem:  After a game is finished, the Game class calls the changeScreen method: main.changeScreen(this, main.GameOverScreen) .  This replaces the game screen with a game over screen. Pressing the "New Game" button in the game-over screen, calls main.changeScreen(this, main.GameScreen) .  The problem: Pressing the "New Game" button in the game-over screen, indeed displays once again the instance of the Game class. But this is the old instance, so the game is not restarted. It's already finished.  I tried to do the following changes in changeScreen():  public void changeScreen(JPanel from, JPanel to){      mainPanel.remove(from);      if(to.equals(gameScreen)){         gameScreen = null;         gameScreen = new GameScreen(this);     }     mainPanel.add(gameScreen);      mainPanel.revalidate();     mainPanel.repaint();  }   This should reset the gameScreen object. But this creates a delay of about 10 seconds when pressing the "New Game" button.  What would be a good way of restarting the game?  Thank you Let's make the hot network questions icons clickable I would like to see the icons in the 'Hot Network Questions' right panel clickable, leading to the homepage of the site where the question comes from.  It would make it more comfortable to switch to the site when you want rather to visit it than to see that specific "hot" question. Drush from GitHub stopped working I have a  that has been working since it moved there.  I did a git pull this morning, and am now getting errors:     $ drush      Warning: require(/home/mpd/drush/vendor/autoload.php): failed to open   stream: No such file or directory in   /home/mpd/drush/includes/bootstrap.inc on line 1007      Fatal error: require(): Failed opening required   '/home/mpd/drush/vendor/autoload.php' (include_path='.:') in   /home/mpd/drush/includes/bootstrap.inc on line 1007   How can I fix this? Can anyone help me with a solution? Write down the assumptions in a form of clauses and give a resolution proof that the proposition                               $$\Big((p \rightarrow q) \land ( q \rightarrow r) \land p \Big) \rightarrow r$$  is a tautology. Making a string out of a string and an integer in Python HTTP Callout from Triggers I have a trigger on the Custom Object that calls a class. That class makes an HTTP GET request to a Web Service.  However I get the following error:  Callout from triggers are currently not supported.  How can I get data to an external Web Service using Apex code?  However i can use @future method but it can only be support void and this method cannot return results, i need to be able to send data to external ervice and receive acknowlegements from it. ON creating BITMAP INDEX on a table in mysql throws error I have database named "demo_dev" and added a table named "countries".  I wanted to create a bitmap index on a column, say, region as it has fewer unique values, using following query.   CREATE BITMAP INDEX ON countries (region);   It threw an error as shown below:     You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'BITMAP INDEX ON countries (region)'   What shoud be done for it to run successfully?  I just refered the following link :   mysql version : 5.5 I've been looking for this feature in Blender, either upon the time of creation using Edge Cut and Slide or afterwards, in just editing the mesh. I'd like to know if it's possible to evenly slide two edges away from one another in Blender?  Here's a picture of what I'd like to be able to do:    Thanks upfront!! Let $ f: \mathbb {R} \rightarrow {\mathbb {R}} $ be given by   $$ f (x) = \left \{\begin {matrix} \sin ({\frac {1} {x}}), &amp; \text {if} \phantom {a} x \neq 0; \\  c, &amp; \text {if} \phantom {a} x = 0 \end {matrix} \right. $$ where $ c \in [-1,1]$. For what values ​​of $c$ is there an antiderivative of $f$?  I do not know of a theorem of the form "if and only if" that  it tells me when a function $ f $ has no antiderivative.  Anyone have a suggestion? I've been wondering about this for a while, since getting interested in knife sharpening.  When using a knife, it will get duller. One (the primary) reason being that you "bend" the edge. You fix this using a honing steel.  After a while though, you need to sharpen the knife again.  Another setting: If you have a brittle knife and/or mistreat your knife you will chip it.   As far as I can tell, this should mean that small pieces of metal (dust, shavings, etc.) come lose, and then likely get in the food.  Is this correct? Are there no health considerations when digesting small pieces of very sharp metal? change environment of a running process How might it be possible to alter some variable in the env of an already running process, for example through /proc/PID/environ? That "file" is read-only.  Need to change or unset the DISPLAY variable of a long-running batch job without killing it. Prove any orthogonal 2-by-2 can be written in one of these forms.... I'd like to prove that any orthogonal $2 \times 2$ matrix can be written   $$\bigg(\begin{matrix}    \cos x &amp; -\sin x  \\     \sin x &amp; \cos x   \end{matrix}\bigg) \hspace{1.0em} \text{or} \hspace{1.0em} \bigg(\begin{matrix}    \cos x &amp; \sin x \\    \sin x &amp; -\cos x \end{matrix}\bigg)$$  for $0 \le x &lt; 2\pi$.  I have no idea how to do this. I feel like this is something I've missed and is really straightforward but I can't find it in my book...