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What are the most useful gems to use in Rails?
RubyGems were developed to simplify and accelerate the stages of the application creation deployment and library connection. Utilizing this package manager for Ruby saves you time as you get ready-made solutions to almost any task instead of writing the functions from scratch. Each gem contains a particular element of functionality including all related files. Unfortunately they aren structured in any way so in order to find ruby gems it better to use a regular search engine and the required key words (check GitHub s ). Our dedicated development team also actively employs Ruby Gems in the process of software development. Here is the top of the most popular and useful ruby gems according to our experience GeoCoder s . Being able to connect through itself over 4 APIs this Ruby gem implements both the direct and reverse geocoding by IP address geographical coordinates and even real physical addresses (e.g. the address of the street). Bullet s . The most downloaded Ruby gems out there. It was initially created with an intention to boost software performance. It does so by decreasing the total amount of client-server requests. Basically Bullet tracks the N+1 cases of requests and notifies the developer when other tools can be used instead (e.g. cache counter). Pry s . We rmend to simplify the bug fixing procedures for your RoR-based application with the Pry gem which is a more advanced alternative to the standard IRB wrapper. ActiveModelSerializers s (which starts lagging while processingpound documents) and uses caching. Fast JSON API s . Fast JSON API wille in handy when you need fast serialization of software code. It works much faster than Wicked PDF s . This gem is working alongside with wkhtmltopdf s and helps realizing an interaction with the DSL generator. Devise Masquerade s . This Ruby gem helps developing multi user apps. In particular youll be able to test your app from the perspective of users with different levels of access. Devise s . Based on the MVC model the Devise gem can provide secure user authentication and session management. Letter opener s . If you need to create a newsletter mechanism to send notifications to all users that launched your app this gem will help you do that much easier you won need to integrate and configure your own SMTP server. Money Rails s . If you are planning to integrate your app with Ruby Money this gem wille in quite handy. Pundit s . A tool that allows defining different levels of access to the app functionality according to the rights of an authorized user.
How can I use an LCR meter to fully characterize a transistor with three terminals?
If you mean DC parameters you can't really measure things like a BJT's ISE or NF or MOSFET parameters with an LCR meter alone. You do need one for the AC parameters of junction capacitances (e.g. Cbc Cbe). So you can not fully characterize any transistor with only an LCR meter. You need an SMU of instrument for measurement low currents and voltages (such as the Keysight B15A Semiconductor Device Parameter Analyzer or the Keithley 42-SCS Parameter Analyzer or any number of similar sister products). Obviously SPICE parameterse from some where and they usuallye from using abination of both SMU and LCR meter. Both the B15A and the K42 have optional LCR meters you can add on or you can use an external LCR meter. There are certain special considerations to using an LCR meter on a 3-terminal device. The problem arises in that you have things like PN junction diffusion capacitances which if you leave the 3rd terminal open will mess up the remaining 2 terminal measurements and if you short the 3rd terminal to ground will also mess up the measurement. This is where a very simple measurement technique called guardinges in. It turns out that a typical 4-terminal LCR meter has a 5th guard terminal namely the shield of the BNC connectors are NOT ground but a driven guard. The details of proper LCR meters are exhaustively described in Keysight's Impedance Measurement Handbook (pdf).n Be aware low-end handheld LCR meters DO NOT implement the right kind of circuitry to guard like this so they don't generally make such measurements correctly. You need a auto balancing bridge style of LCR meter which is not the kind typically used in handheld units. There are many legacy HP LCR meters that do the job basically they all start with 42xx (the old HP LCR meter prefix) so 4284A 4276A 4285A etc. italic Taken from page 5-19 (absolute page 15) shows how to correctly measure all terminal capacitances for a MOSFET. The same exact technique works for BJTs JFETs vacuum tubes etc. n nThese are the standard setups used to SPICE extraction tools like Keysight's IC-CAP Device Modeling Software . This is how SPICE parameters get extracted. (I used to be an apps engineer at HP T&M now Keysight for SMUs LCRs ICCAP and all related semiconductor test equipment).
How do I fix a printer driver that is unavailable on Windows 10?
If a software driver for hardware is unavailable it can be fixed because it not broken because it does not even exist. Contact the maker of the printer for an updated driver or work-around. Get a different printer. Put a cheap used $5puter or one of your own oldputers by the printer to act as a print server ... though Windows 1 may still balk so then print to PDF then send the PDF to the print serverputer ( or sneaker-net a USB thumb drive to the print serverputer ). Print to a PDF file then convert each PDF page to a JPG then rename them all properly for your camera then copy the files to your camera storage card and insert it in your camera then connect your camera via USB cable directly to the printer DPOF port and then select the DPOF Digital Print Order Format option on the camera to print the files directly to the printer. If the printer has a scanner then lay yourputer monitor on the scanner and print a copy of the document displayed on theputer screen that way. ordered-list Why do people think aputer has to do all the work? - - - - - - - - - - In dialog with others in this thread Other Install a driver manually for a printer that the unsupported printer emulates. You can also get Global' drivers from the bigger manufacture that both support a wide range of printers and arepatible with terminal services desktop. Sometimes extracting the drivers for the printer for a previous OS you can manually install the driver from the folder. This doesn't always work. You may have to share the printer from a system running an OS for which there is a suitable driver. Have you waited the 45 minutes it takes Windows to download additional printer drivers? Me Windows 1 will want a driver on board to print to a network printer same problem.. Other As another answer exed sometimes only installing the core printer driver of an network shared printer will work. Whereas the full driver fails. Especially things like smart spoolers. And again emulation is your friend. Me core italic ? Do you mean for say an multi-function printer installing just the printer? What is core italic ?. Other What gets installed to the spool sub-directories. And then just the subset for turning WMF format to something the printer can render. Me Prior posts installing the core printer driver of an network shared printer What gets installed to the spool sub-directories. And then just the subset for turning WMF format to something the printer can render Ill try the core drive by doing what?Thanks.. Other Hence me referring to an other answer by HRH George J Rickle IV user 139664983 Me Ah you see Install the driver from Windows 7 or Windows 8. Use the absolute minimum driver possible ignoring all the addons. Install the minimum necessary to print. If there is a network print driver THAT is the one even if you don't use it on the of that it probably works generically with a PCL or PostScript driver from Windows from HRH George J Rickle IV's answer to How do I fix a printer driver that is unavailable on Windows 1? answer aid 195314435 as meaning core. I was wondering if people were seeing core as a choice within any Microsoft driver installation dialog and choices especially because I could not find such an on-screen reference choice. So no the phrase core printer driver will not appear on screen anywhere for users to select. Right? Other Using Updated Core Print Drivers - Windows drivers s Along with the manufacturer inf files for the specific device. Me THANK YOU for the reference to Microsoft using the core print drivers phrase UniDrv PostScript and XPSDrv are examples of core driverponents that many manufacturer-supplied drivers rely on to help with printer control and configuration even though it never shows up in any Windows printer dialogs ( below ) or even Windows help ( above ). PCL PS and XPs no UniDrv hmm. but no core print drivers anywhere. By the way did you know of the official Microsoft web reference page to core print drivers before or after you used the phrase in ? Just asking. Other Given the problems some printer drivers cause for Terminal Services and Citrix and having to remedy that yes I came across the term years ago while working for Microsoft Product Support Services (external badge). Also why I exed the use of Global drivers. Other Addingments disabled. Me Global oh Addingments disabled I guess Ill guess at what you mean and look elsewhere. Thanks for exploring as much as you did. - - - - - - - - - -
What are Linux commands to backup the files on system, to open the PDF file in terminal, to view the text files in the terminal, and to find the currently running processes in the system?
There lots of ways to do all of the above depending on what you want and how your system is configured. If you have an external drive mounted you can use for backup one of the following some of which require customizing a configuration file and all of which require various options or arguments and all of which have recursive options to copy an entire directory structure cp -p # copy the file list to the target directory preserving file stats cpio # copy in Lots of options to copy from another directory on the same system or piped through a network connection with -o to stream to anotherputer and reassemble the copies with the -I option tar # create or extract from a Tape ARchive format stream usually created withpression to local storage or piped to a remotemand for writing to media. Achieves very highpression iterated over entire stream which can contain entire directory structures scp # secure copy use SSH to copy files to another machine rsync # intelligently copy files to another directory or machine sending only changed files and optionally deleting files no longer existing on the sending side rsnapshot # make a recoverable image of the current state of directories listed in the configuration file with staged backups selected with an argument keyword to perform hoy daily weekly monthly and quarterly backups or any other schedule you configure. You can snapshot the local system and also remote systems using SSH. duplicity # utility to incrementally backup to local or remote storage. PDFs are graphical in nature but if you are limited to terminal only pdfto # part of the Poppler Utilities a set ofmand-line utilities to manipulate PDF files To view files in the terminal you can use editors in read-only mode view # an alias for vim or vi In read-only mode nano -v # a menued editor in read-only mode Or use pagingmands like more # page forward or search forward screen or line at a time less # page forward or backward Processes ps # shows entire process table or those processes owned by you with detail depending on options and arguments top # shows most active and most resource-intensive processes memory and CPU usage.
Why I love Linux — even if I no longer use it?
I love Linux so much I made a list of 5 reasons why I love it so. I can extract something with onemand without opening a separate program. I can update all applications with two magical words apt-get upgrade. Its free as in beer. I can run on pretty much any hardware. Well documented A standard help system that is actually useful (man) Many of the best programs are available for Linux for free. ie. Apache MySQL ProFTPd SSH OpenVPN. You would have to pay hundreds if not thousands of dollars for Windows programs that aplish the same thing. On top of that you will have to pay for support Linux can be configured to run without a GUI for max performance. This is especially useful for servers. Other operating systems don have this luxury. Many of the programs are configured with a simple config file. This makes editing much easier than navigating through pages and pages of tabs and radio check boxes. You can even structure your config file with your ownments to make editing easier for you. Change something often? Put it near the top. If you switch something on and off often and it is buried behind 9 gui screens it might take you 1 5 times longer to switch it. Linux wont tell me that my automatic updates are turned off every single minute of every day. Linux pretty much forces you to be a non-administrative user. Depending on the distro it is a lot easier to install than Windows. Linuxes with drivers for my onboard Sata where Windows XP does not. With Linux we canpile our own kernel so we don have to a wear a one size fits all hat. You don have to worry about spyware viruses or worms. Even if they were prevalent they couldn be installed unless you did it yourself. You can check your CPU temperature without installing any software. To list the contents of a directory I only have to use two keys instead of three (ls vs. dir). I can build aputer myself and still get a good price on the retail version of Linux (free). Linux tends not to hide details Linuxes with a program that will eject my CD-Rom. Thises in handy when making automated CD backups and other scripts. I can print an entire directory of pdfs with lpr *.pdf . In Windows you would have to open each with Foxit Reader or the bloated Adobe Acrobat. You can choose a filesystem that better fits your needs. With Windows you have two options old out of date crappy NTFS or even more out dated FAT32. It supports more than 3 of ram without updates and hacks. It doesn crash ever Its so reliablepanies have used it as dedicated router firmware. When there is a security exploit I can expect a patch the next day not the second Tuesday of every month. ordered-list