An electrical resonant circuit is a resonant electrical circuit consisting of a coil and a capacitor that can perform electrical oscillations. The electric oscillating circuit is often compared to the harmonic oscillator of mechanics such as the spring pendulum or tuning fork. In this resonant circuit, energy is periodically exchanged between the magnetic field of the coil and the electric field … [Read more...]
Computer and Internet
Computer and Internet is catchall section of core computing categories including Cloud Computing, Digital Photography, Virtualization, Networking, Protocols and Others' which are not otherwise more subcategorized. Here also you will get unique articles and news on computer hardware, Software, Networking and Protocols.
Operation of Solar Inverters
Solar inverter refers to a special type of inverter that converts the DC voltage of the solar cells into alternating voltage and is optimized for operation with solar modules. This inverter is part of a photovoltaic system and has the task of feeding the electrical energy generated into the power grid. On the input side to the solar cells, there is usually a DC converter with a maximum power … [Read more...]
Application of Inverter
An inverter is an electrical device that converts direct current into alternating voltage. In addition to rectifiers, DC converters and converters, inverters form a subgroup of power converters. Depending on the application, inverters generate either a single-phase or multi-phase output current or a single- or multi-phase output voltage. The efficiency of semiconductor-based devices can reach up … [Read more...]
Required Professional Skills of a System Administrator
A system administrator or (informally) admin, sysadmin manages computer systems on the basis of broad access rights to the system. System administrators plan, install, configure, and maintain the information technology (IT) infrastructure of a company or other organizations. As operators, they carry out the manual activities required for the ongoing operation of the computer equipment. In many … [Read more...]
How to Install Apache and PHP on Ubuntu 22.04 Server
This guide is intended for operating a WordPress or similar PHP-MySQL-based application on a dedicated or cloud/VPS server with 12GB to 16 GB. You can use a server from any web host of your choice. We can suggest you use VPSDime OpenVZ instances for small to medium websites. 6GB RAM, 10Gbps connection instances will cost you $7.00/mo. If you need dedicated resources, then you can test their … [Read more...]
Basics of Bootloader
A bootloader, from the shortened form of the original word bootstrap loader), also known as a launcher, is a special piece of software that is usually installed by a computer's system firmware (e.g., the BIOS, Open Firmware, or UEFI) from a bootable medium. loaded and then executed. The bootloader then loads other parts of the operating system, usually a kernel. This is why we often talk about … [Read more...]
What is Rootkit
A rootkit (administrator kit; root is the user with administrator privileges on Unix-like operating systems) is a collection of software tools that is installed on the compromised system after breaking into a software system in order to hide future logins of the intruder and hide processes and files. Today, the term is no longer limited to Unix-based operating systems, as rootkits for other … [Read more...]
What is Superuser (Root Account) in Unix & Linux
The root account or superuser account is the user account that must be created when installing an operating system and is equipped with the most extensive access rights. This account is not intended for day-to-day use of the system, but only for special administrative tasks because it involves extensive risks. For example, in the guide to Set up a passwordless SSH Login, we have asked the readers … [Read more...]
How To Set up a Passwordless SSH Login in Ubuntu 22.04
This guide is intended to disable the password-based SSH login for the root user and create an identity file-based SSH authentication like AWS, HP cloud provides a way to log in. If you are using VPSDime, you will get the option while reinstalling OS. Still, many of the web hosts deliver SSH login using the root user account. This is a security risk since any attacker can easily guess the username … [Read more...]
What is Rapid Prototyping
Rapid prototyping is the umbrella term for various processes for the rapid production of sample components based on the design data. Most rapid prototyping processes – except, for example, polyamide casting – can be attributed to additive manufacturing or .dem 3D printing because they work with layer-by-layer material application and without the use of a mold. Rapid prototyping refers to the type … [Read more...]
Install & Configure Fail2Ban on Ubuntu 22.04 (Apache2)
Fail2ban is an intrusion prevention system written in Python that runs on all POSIX operating systems that have a tamperable packet filtering system or firewall (e.g. iptables on Linux). The main purpose of fail2ban is to determine and block specific IP addresses that are likely to belong to attackers who want to gain access to the system. fail2ban identifies IP addresses from log files that … [Read more...]