![]() ![]() ![]() When the space is not limited and a higher gain is required, the proposed origami antenna can be transformed to a series antenna array by pulling the frame. In limited space, the proposed origami antenna can work as a single antenna. We propose a push/pull origami antenna, transformable between a single antenna element and a three-element array. Five lessons, designed for Strength of Materials and Theory of Structures courses, which cover tensile testing, the analysis of trusses and plane frames, bolted and welded joints, and constructive details in reinforced concrete structures are discussed. Offer interesting advantages in terms of their lower cost, easy manipulation, low weight and short time of production. These printed models can be used as specimens in lab tests and also as visualization objects to improve students’ comprehension in lectures. Stability, strength and rigidity of built structures, the use of 3D printed models is put forward. To improve their understanding and their ability to calculate the In this work, a set of laboratory activities aimed at enhancing the learning–teaching experience of sophomore and junior students of engineering degrees related to structures is presented. If you had a license key, go to the Register page and activate your license key.Three-dimensional (3D) printing is a promising tool in Engineering education, as it can facilitate learning, contribute to the development of key skills and competences, increase the engagement and interest of students, and promote their creativity.Open Repetier-Server in your browser and go to Global Settings WLAN and make sure that Hostname, SSID and Region in Connection Settings are set like before.Do not forget to save your password on a place, where you’ll find it later. Enter in ssh console:Īnd change your password. Make your Pi more secure by using your own password.Go to Localisation Options Change Timezone, select your country and finish. Set the correct time zone in ssh console:.Copy them to /var/lib/Repetier-Server with a secure copy software like WinSCP or scp. Now it’s time to restore your backup files.Sudo chown -R pi /var/lib/Repetier-Server Now you need to change the permissions of /var/lib/Repetier-Server, so you can overwrite the files:.Start the Pi and connect it to the network.Download the new Raspberry Pi image here and install it as described on your sd card.Now we have all relevant data on a different computer, so we can shut down the pi in ssh console:.But with the old files it should be much easier to restore the old state. New image might have new settings in the files. Typical things you might have done are modifying /boot/config.txt, /boot/cmdline.txt, adding own scripts, installing additional display drivers, … Note that you can not always just blindly copy old configs back. If you made other changes to linux to get the image working also backup these files.The simplest solution to backup all files and folders in this directory is using a secure copy software like WinSCP or scp on your target PC, where you want to store the backup. These are stored in the directory /var/lib/Repetier-Server and it’s subdirectories. Now it’s time to backup all settings and data.The default user is pi and the default password is raspberry. Go to Global Settings WLAN and note your Hostname, SSID and Region in Connection Settings.If you have a license, write down your license key and deactivate it on the Register page.If you have two sd cards, we recommand to create the new image on the second sd card (ideally a high endurance sd card for increased data safety) so you know you have a working fallback. So we will describe here in detail how to transfer your old settings to the new image. ![]() Of course you will want to keep your old settings and data. We regularly revise our Raspberry Pi image and add new features, so it makes sense to upgrade, especially if the operating system version has changed. ![]()
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