Whenever my phone can be plugged (via a USB cable) into my laptop computer, my laptop will charge my phone's battery. But how can I reverse this charging, to command my phone's battery to charge my laptop?
Can I charge computers by inducing 5-volt into their USB connectors? Is this possible? I noticed that when my EeePC 900 is off but plugged in charger, there is power coming out of the USB port. Can this be a sustainable way of charging a PC, or a flaw in design?
What are the correct settings for min-memory and max-memory in this use case?  The server has 8GB ram, dual Intel Xeon processors, running Windows Server 2008 R2 / Sql Server 2008 Standard Edition. It's running several databases ranging from 30GB - 5GB in size.  Originally the memory usage was set to the default settings (min=0 max=2,147,483,647). On these settings most of the memory usage was taken up by sqlservr.exe and the server would eventually need to be restarted every day or two. It would run normally at first but within a day start to timeout on simple operations like looking up a record using the primary key.   I have changed min=4,096 and max=6,144. This results in only 1.4GB memory usage. However now all four cpus are running at 50-60% cpu usage constantly. Tasks are taking roughly 1/3rd longer to execute, although the server is much more stable. I have this function $$f(x) = x\cos(1/x)$$ defined for all $x \geq 1$.      How do I prove that    $$f(x+2)-f(x)&gt;2$$    for all $x\geq 1$?   I found $$f'(x)= \cos(1/x) + \frac{\sin(1/x)}{x}$$ and $$f''(x)=-\frac{\cos(1/x)}{x^3}.$$ How do i use this information? Cheat-proof online die roller? I am looking for an online die roller that works similarly to the following:   The GM provides a string identifier to the player. E.g., "gandalf attacks balrog #12"   The player enters the id on the roller site, which checks it for uniqueness vs the DB, then generates the results, lined to that id.   The GM can check the results by id.     An alternative implementation would be for the GM to request a range of pre-generated ids from the site and hand them out to the players for rolls. E.g., "please roll 5d8 with id #314159265"  Is there anything similar?  Notes and Clarifications:  As Thales Sarczuk inferred, this is indeed for "play by forum/email" games.  The idea is to have "verifiable" rolls, preventing "roll until you you get a good result" scenarios. However, it will be used on forums that are not gaming-specific so using plugins is not an option.  Thank you! The mdframed environment fails to break into several pages (slides) when used in a frame environment from the beamer class.  In the other hand, the boitecoloriee environment from the boites package can be broken into several pages.  Here is a document that demonstrates the issue. It should not be compiled directly into pdf because boitecoloriee uses pstricks.  \documentclass{beamer} \usepackage{xcolor,boites,boites_exemples,pstricks} \usepackage{mdframed} \usepackage{lipsum}  \begin{document}  \begin{frame}[allowframebreaks]{Using \texttt{boitecoloriee}}   \begin{boitecoloriee}     \lipsum[1-2]   \end{boitecoloriee} \end{frame}  \begin{frame}[allowframebreaks]{Using \texttt{mdframed}}   \begin{mdframed}     \lipsum[1-2]   \end{mdframed} \end{frame}  \end{document}   Maybe is there a way to fix mdframed to work in slides too. Any clues? Is a quotient group a subgroup? Is a quotient group a subgroup?   I am trying to solve the question below, and if the answer to above is "yes," then my proof will follow below.   I am trying to prove that a cyclic group G, has a cyclic quotient group G/N.  Where N is a normal subgroup.  A SUBGROUP OF A CYCLIC GROUP IS CYCLIC.  By   So if   (1) G is cyclic   (2) G/N is a subgroup   (3) G/N is a cyclic subgroup   (4) The Quotient group G/N is cyclic   I am unsure about my reasoning in step (2), Is this a valid assumption? I recently updated my version of Lyx from 1.6.7 to 2.0.6. I would like to transfer my old keyboard shortcuts to this new version, but I am having difficulty because I was inconsistent with the way that I set them up:   Some were defined in the specified .bind file,  but others were modified in the lyx preferences menu.   I found that when importing my old .bind file into this updated version of lyx, it imported the keyboard shortcuts that were in the .bind file, but not those that I had added in the preferences menu.  Does anyone know if these keyboard shortcuts that were added via the preferences menu are stored in another .bind file somewhere in the lyx directory? Has anyone else successfully transferred keyboard shortcuts that had been implimented in the preferences menu? Can I deploy Juju on Eucalyptus? Please let me know if I can deploy juju on Eucalyptus, if yes please provide me the configuration details which i need to edit on environments.yaml file. Is it possible to upgrade a BGA 1224 CPU? I want to upgrade the CPU of my T430s laptop from i7-3520M to i7-3632QM. I'm sure i7-3632QM is supported (same socket (BGA1224), same TDP (35W) and microcode found in BIOS (306A9.PAT)).  So my question is: 1) is it possible to de-solder the current CPU without damaging it, and to solder the new CPU without damaging it and the motherboard ? 2) if so, what tools are necessary? who can do that at a reasonnable cost?  Until now, I was unable to find anyone able (or willing) to do that (I'm located in France, and I have tried a local fablab, electronics shops, TV repair shops, ...). Any hint would be appreciated. Associated elements in a ring Please help me to find elements $a,b$ in a ring $R$ such that $a\mid b$ and $b\mid a$, but there does not exist any unit $u$ in $R$ such that $a=ub$. I masked an image in the UV/Image editor masking section. I then used that mask in the compositor for background replacement. However, the mask size seems to be different. Why is that? Here's a screenshot: A basic grammar rule is to use an instead of a before a vowel sound. Given that historic is not pronounced with a silent h, I use “a historic”. Is this correct? What about heroic? Should be “It was a heroic act” or “It was an heroic act”?  I remember reading somewhere that the h is sometimes silent, in which case it’s an, and when the h is pronounced, it’s a. But then I also remember reading that it depends on which syllable is stressed. And I also think I read somewhere that it might differ between British and American English.  Personally, I pronounce the h, and believe that a is correct. I find that it sounds incorrect to use an and pronounce heroic without the h.  So how do I know when to use a and when to use an with a word beginning with the letter h? Are both acceptable or is there one that is correct? Seeing through objects in Game engine How to change kernel at boot I installed the latest kernel (4.1) and want to boot into it instead of 3.9. How can i do this on ubuntu 15.04? How to include python script inside a bash script I am trying to get this trigger to work but it is giving me an error and I am not able to figure out why. The error I am getting is "attempt to de-reference a null object)  Why trigger? We have a Destinations object which is linked to Supplier products object via a lookup relationship. There are two types of supplier products(marketplace and curated) We want to count the number of live Supplier products and put them in a separate fields(live counts for each type).  I have gotten so far to actually count the number of live products and it is giving me an error. Can any one help? I am posting the code below  Trigger code :   trigger NoOfLiveProducts on Supplier_Product__c (after insert, after Delete, after update, after undelete) {       set&lt;string&gt; destinationids = new set&lt;string&gt;();      if(trigger.isInsert) {         for(Supplier_product__c products : Trigger.new) {             destinationids.add(products.Destination__c);         }     } else if(trigger.isDelete) {         for(Supplier_product__c products : Trigger.old) {             destinationids.add(products.Destination__c);         }     }else if(trigger.isUnDelete) {         for(Supplier_product__c products : Trigger.new){             destinationids.add(products.Destination__c);         }      } else if(trigger.isUpdate) {         for(Supplier_product__c products : Trigger.new) {             destinationids.add(products.Destination__c);         }     }      if(destinationids.size() &gt; 0){         Productcounter pc = new Productcounter();         pc.updateproductCount(destinationids);     }    }   Class code :  public class Productcounter {      public void updateproductcount(set&lt;string&gt; productIDs) {           if(productIDs == null){                return;         }          if(productIDs.size() == 0){             return;         }           list&lt;Supplier_Product__c&gt; ProductList = new list&lt;Supplier_Product__c&gt;();         ProductList = [Select ID,Destination__c                     From Supplier_Product__c                     Where Destination__c = :productIDs];          integer totalCount;         map&lt;string, integer&gt; DestinationIDToProductCountMap = new map&lt;string, integer&gt;();                for(Supplier_product__c ProductItem : ProductList){             if(DestinationIDToProductCountMap.containsKey(ProductItem.Destination__c)){                 totalCount = DestinationIDToProductCountMap.get(ProductItem.Destination__c);             }else{                 totalCount = 0;             }             totalCount += 1;             DestinationIDToProductCountMap.put(ProductItem.Destination__c, totalCount);         }          list&lt;Destination__c&gt; DestinationUpdateList = new list&lt;Destination__c&gt;();         Destination__c DestinationTemp;         for(string ProductID : DestinationIDToProductCountMap.keySet()){             DestinationTemp.ID = ProductID;             DestinationTemp.No_of_Live_Curated_Products__c = DestinationIDToProductCountMap.get(ProductID);             DestinationUpdateList.add(DestinationTemp);         }         if(DestinationUpdateList.size() &gt; 0){             update DestinationUpdateList;         }           }           } So, say you are a wizard 15/warlock 2. You have the Lance of Lethargy invocation, which pushes an enemy you target with eldritch blast and hit back 10 feet. Say you put a demiplane entrance ~5 feet behind the enemy you target with it. When you hit, you throw the enemy in. Before all this, you had put a Glyph of Warding in there on one of the surfaces. What would be the limit to the trigger for this? Would it be forced to be touch or proximity, or could you base it off something like hostility towards the caster?      ... When you cast this spell, you inscribe a glyph that later unleashes a magical effect ... You decide what triggers the glyph when you cast the spell. For glyphs inscribed on a surface, the most typical triggers include touching or standing on the glyph, ... (PHB 245)   The key word here is "typical". Based on Google's definition, the informal definition of "typical" is     showing the characteristics expected of or popularly associated with a particular person, situation, or thing.   This means, if my assumption is true, that the triggers in the PHB are only the most common ones. Other than the one about being forcibly at maximum 10 feet in diameter in the PHB, I cannot see a limit. Though I probably should assume this would all be DM discretion, (and I know that I sound like a broken record here) but could the trigger be hostility toward the caster, or something else, like being a specific race, gender, from a specific place, etc., or would it be forced to being something from the PHB? iBooks preview not working? I recently converted one of my books into an iBooks format using Author. However when I connected to my iPad and went into 'preview', I saw my device, clicked it, but the 'preview' button to enable the previewing process was faded and I could not click it. Has anyone actually used the preview feature enough to give me some help? Thanks! Sorting Directory.GetFiles() System.IO.Directory.GetFiles() returns a string[].  What is the default sort order for the returned values?  I'm assuming by name, but if so how much does the current culture effect it?  Can you change it to something like creation date?   Update: MSDN points out that the sort order is not guaranteed for .Net 3.5, but the 2.0 version of the page doesn't say anything at all and neither page will help you sort by things like creation or modification time.  That information is lost once you have the array (it contains only strings).  I could build a comparer that would check for each file it gets, but that means accessing the file system repeatedly when presumably the .GetFiles() method already does this.  Seems very inefficient. My wife wants a 4th baby, but I don't My wife wants a 4th baby, but I don't.  We have been talking about it for the last few days (talking strongly).   I have raised points such as:   We will get less time to spend with our current kids. The age gap between the first and the last will be too wide. It will cost more money. She will be out of work longer. We will need a bigger house. And we don't even have our own house yet (we are still renting). We will have to start again. Sleepless nights, nappies, feeding, new cot, car seat, etc etc.   She says:   She feels like she is missing something. She has always wanted a large family. Things will be the same regardless of having 3, or 4 kids. She agrees that money will be tighter, but wants to push through it.   Our current kids are 9 months, 2 years, and 4 years. We are young married couple (25), and I have a fairly decent job.  What would be the pros and cons of having another child?   How can we rationally talk to the other about having/or not having another child?  And what should we do if we cannot agree? Is it possible to raise stats?