I have a single 12V 2A power supply which is powering 4 CCTV cameras which require a 12V 1A power supply each in addition to an illuminator lamp which requires 12V 2A supply.  At the moment everything is working fine. Is that arrangement ok into the future?  If not please advise me on what single power supply is needed to meet the needs of the 4 cameras and the illuminator lamp.
Power supplies are available in a wide range of voltage and current ratings.  If I have a device that has specific voltage and current ratings, how do those relate to the power ratings I need to specify?  What if I don't know the device's specs, but am replacing a previous power supply with particular ratings?  Is it OK to go lower voltage, or should it always be higher?  What about current?  I don't want a 10 A supply to damage my 1 A device.
How can I import a .c4d static model (Cinema 4d) on Blender? Is there any plugin could help me? I didn't notice anything on Internet. I´m trying to model a race track using a bezier curve, but, when I add modifiers -> array -> curve I get this :    What should I check for to get the mesh following the curve correctly ? Thankyou Summoning an item in 1.9 with motion When I put   /summon Item ~ ~2 ~ {Item:{id:"minecraft:diamond",Count:1b,Motion:[0.0,0.8,0.0]}}    in a command block, it summons the diamond with Count:1b but it doesn't follow the Motion Tag. Does anyone know how to get the Motion Tag working? Is there a benchmark tool for Ubuntu? Is there a benchmark tool to measure computer performance for Ubuntu like SuperPI, 3DMark, or PCMark? population and subsamples : mean equality? I want to perform a two sample test, to see whether theirs means are equals. One of the sample is rather big (#60000 values) and represents the scores of a whole population. This population is partitioned in small classes of less that 1000 people. The other sample of the test is a subsamble of the former. It corresponds to people of the same class. So, each time, there is less than 1000 values in it. I have no idea about the variances, so I'd think of using Welch's t-test.  But I'm concerned regarding the independence hypothesis: can it be valid, considering that the second sample is negligible when compared to the overall population? Find all the numbers $n$ such that $\frac{4n-5}{60-12n}$ can't be reduced. I look today on a few fresh question, and the view count was 0. Even after I refreshed the page a few time. This is definitely a bug, since the question isn't mine.  Also I don't think the all page was cached, since that the DateTime mark was change every reload.  But maybe the SQL result is cached. Distance between points along polyline ArcGIS for Desktop? I'm using ArcGIS 10.3 (Desktop), and I'm trying to measure the distance between points following a path determined by a set of polylines.  Hand measurement is not a viable option-- there are ~7500 points, and my polyline set is the global coastline.  The ultimate goal is to get the spacing of these points along the polylines, so that I can analyze this with respect to a few other variables.   I can read python-- with a bit of effort-- but not write or edit it, so code-based solutions will not be particularly useful to me.  I have tried using the linear referencing tools-- I snapped the points to the lines, then transformed the polylines to routes and used 'locate features'-- but because my points are not (entirely) ordered along the path, using the difference between  linear reference locations of subsequent points yields some fairly unlikely answers.  In addition, spot checks of (hand-measured, using the built-in path length measuring tool) point-to-point along-polyline distance yield different answers than given by the corresponding linear references for the point pair. (Some of the answers were close enough that they could very well be measurement error on my part, but others were nearly 20%, despite my having zoomed in and snapped the measurement cursor to the polyline, proceeding vertex-to-vertex.)  Sorting first by linear distance seems to fix the first problem, but in light of the second one, I remain skeptical of this process.   I then tried simply splitting the polylines into segments ('split line at point') using the (snapped) points as the dividers, with the eventual goal of finding the segment length with the calculate geometry feature.  This produced gibberish. I'm not sure what criteria ArcGIS used to split the lines, but it wasn't the point set I provided.  Segments in the resulting shapefile ran right through tens of points, only to terminate at a place with no point. (Also, there were segments utterly empty of points...you get the gist.) I reiterate that the pointset was specifically snapped to the polylines, so this problem shouldn't be caused by excessive distance between the point and the polyline.  I'm at a bit of a loss, here: could someone point out where I might have gone astray and/or suggest a solution?  Or, failing that, a new method that I could try?  It seems like a fairly basic (not necessarily simple, but fundamental) analysis to do with geographic data, and I don't understand why it has presented so many difficulties. Changing the size of the mouse pointer in Ubuntu MATE 18.04 does not work I have Ubuntu 18.04 with the gnome-desktop  and parallel the Ubuntu MATE desktop installed. While I can easily change the size of the mouse pointer (DMZ-White) in the Gnome3 desktop , this does not work on the MATE desktop. I use for this the dconf-editor.  Maybe someone knows a solution?  Thanks a lot. Hello,   I create an app using the Promoted Links in Sharepoint 2013. I chose to do this because the feature has the awesome hover effect and is easy to customize the image.  The issue is that I have been trying to figure out how to change the tile sizes. They are awesome the way they are, however I just need them smaller. I still want the hover effect as well and for the text to match the same ratio as the tile. I have tried web zones, I have done each ID but with no luck. I have attached a sample image of the tiles I'm referring to. Please help. Tips and resources for beginning designers Thanks to the internet, graphic design and programming are becoming increasingly overlapping fields.   As a programmer, I constantly find myself needing basic knowledge of Graphic Design, but have trouble locating thorough yet concise graphic design learning resources, and instead usually find bits and pieces of knowledge applicable to the task at hand.  Can you guys offer some tips or recommend some good books, tutorials, blogs, and websites which provide a beginner level overview of web design that have been, in your experience, effective and high quality learning materials. I'm not looking for tips on how to use image editing tools, but assuming a basic grasp of those, which resources and advice will best help a new designer create professional looking designs? Is there a way to "hide" a normal windowed application in Windows?  I'm looking for something that removes it from the taskbar and possibly puts an icon in the system tray instead. Why must a planet be in a star's "habitable zone" to have life? How can I use adb to send a longpress key event? There seems to be some bug where mac os is constantly contacting . You can prevent it by turning off the wifi, but then your computer is nothing more than a fancy calculator. Is there a program, vpn, or even the firewall option, to block this site from the whole os? I recently installed Ubuntu Server edition 13.10 (Saucy Salamander). But I have run into a bit of problem. At the end of the installation, it asks about several extra packages whether you want them or not, like OpenSSH server and virtual machine host. Here's what I'm looking at:  Now, my problem is that I can't remember if I have checked the &quot;virtual machine host&quot; checkbox. How do I check if my server has the corresponding packages? What packages come with the virtual machine host? Given a dictionary, how can I find out if a given key in that dictionary has already been set to a non-None value?  I.e., I want to do this:  my_dict = {}  if (my_dict[key] != None):   my_dict[key] = 1 else:   my_dict[key] += 1   I.e., I want to increment the value if there's already one there, or set it to 1 otherwise. How can I do a line break (line continuation)? I've installed reCAPTCHA module but spam still bypass my security and leave nasty comments. What should I do? How to block them? How can I split a beamer bibliography across two slides?