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Computer interfaces. Schemes, articles, descriptions

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Computer interfaces

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Wind as a source of energy

Section Alternative energy sources. Modern wind turbines are reliable machines that convert wind energy into electricity very efficiently. Therefore, the main question that the consumer asks himself is: Can I use wind turbines in the place where I live. The answer to this question depends on a number of factors, which will be discussed in the following sections. However, the first question to be answered is: Are the wind speeds high enough for the wind turbine to be used in the chosen location? It is possible to establish those regions of the country where there are sufficient wind energy resources using wind atlases. ... >>

Scheme of a lamp with an electromagnetic ballast

Section Ballasts for fluorescent lamps. For an AC network, an ordinary choke with a special core is suitable as a current limiter. The type of inductor must match the type of lamp being switched on, otherwise the lamp may be overloaded and burn out much earlier than its time. The most common and simple LL switching circuit is the starter one (with a simple inductive resistance - a choke, shown in Fig. 3.1). Elements LL1, E1, C1, C2 shown in this diagram form a ballast (abbreviated ballast). Ballast - an electrical device that provides ignition modes and normal operation of a fluorescent lamp ... >>

Power amplifier with balanced differential input stage

Section Transistor power amplifiers. One of the features of this power amplifier is its power supply from a bipolar source. This allows you to turn on the load between the outputs of the amplifier and the common wire without a transition capacitor. Another feature is the use of a balanced differential input stage with good thermal stability. Schematic diagram of the amplifier is shown in fig. 1. It consists of an input stage (transistors VT1. VT2}, a voltage amplification stage (VT3) and an output stage (VT4-VT7) and output transistor protection elements (VD3-VD6). The input stage is made according to the differential stage circuit with an unbalanced output. the signal is fed to the base of the transistor VT1 through the decoupling capacitor C1. The OOC signal is fed from the output through the resistor R6 to the base of the transistor VT2 ... >>

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Articles on computer interfaces

Articles on computer interfaces; schemes of computer interfaces; descriptions of computer interfaces: 43 articles



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Latest news of science and technology, new electronics:

Blinking of the magician and his audience 19.05.2024

Magic and illusions have always captured the attention of the public, but what happens behind the scenes of the magician and in the brains of his audience? Scientists from the UK decided to solve this mystery by conducting a new study involving ten illusionists of varying experience. Illusionists, some of whom had been practicing magic for more than half a century, others for only six months, were invited to demonstrate the same trick - the popular coin trick. Recordings of their performances during training and on stage showed that each of them began to blink significantly more often at the moment of performing the trick. The study's findings indicate that magicians' blink rate may be related to unconscious aspects of their performance. At the same time, as scientists have found, spectators also begin to blink more often, following the movements of the illusionist. This observation supports the idea that magicians may be catalysts for blinking in audiences. Additional research has shown that magicians blink more often during ... >>

Ultrasonic coffee machine 19.05.2024

Iced coffee has become an integral part of coffee culture in recent years. Therefore, engineers from the University of New South Wales decided to improve its preparation. They have developed an ultrasonic coffee machine that reduces the cold brew time for ground coffee beans from 12-24 hours to significantly less time. Iced coffee, or "Cold brew", is popular due to its smoothness, low acidity and low bitterness. It is prepared by steeping ground coffee in cold water for a long time. Unlike traditional hot brewing, which often imparts bitterness to coffee, cold brewing extracts more delicate and complex flavors from the coffee beans. The innovative system, presented by a team of engineers, introduces ultrasonic technology into the coffee preparation process. The system uses ultrasonic waves to speed up the process of extracting oils, flavor and aroma from ground coffee. This allows you to significantly reduce the time ... >>

The speech of sperm whales is similar to that of humans 18.05.2024

In the world of the ocean, where the mysterious and unknown coexists with the studied, sperm whales, with their huge brains, are of particular interest to science. Researchers, working with a huge array of audio recordings collected during the Dominica Sperm Whale Project (DSWP) - more than 8000 recordings, seek to unravel the secrets of their communication and understand the structure and complexity of the language of these mysterious creatures. By studying in detail the recordings of 60 sperm whales in the eastern Caribbean, scientists have revealed surprising features of their communication, revealing the complexity of their language. "Our observations indicate that these whales have a highly developed combinatorial communication system, including rubato and ornaments, which indicates their ability to quickly adapt and vary during communication. Despite significant differences in evolution, sperm whales have elements in their communication that are characteristic of human communication," says Shane Gero, a biologist at Carleton University and director of the CETI project. Issl ... >>

Random news from the Archive

Microsoft is blocking the installation of Linux on its tablets 21.01.2012

Microsoft's special requirement almost completely excludes the possibility of installing third-party operating systems on ARM tablets, including Android, based on the Linux kernel.

Microsoft's requirements for manufacturers of ARM-based tablets that choose to install the Windows 8 operating system include a clause requiring them to use UEFI boot technology. It must be activated without the possibility of manual shutdown (transfer to Custom Mode). This requirement has an interesting consequence: it will significantly complicate the installation of third-party operating systems, writes Digital Trends.

According to Steven Sinofsky, president of Microsoft's Windows and Windows Live division, this measure is aimed at protecting users from unauthorized interference with the firmware - when a malicious application can change the boot algorithm and place malicious code in memory before the OS starts.
A feature of UEFI is that this technology does not allow running operating systems on the device that do not have digital signatures in the factory firmware. Thus, if the manufacturer adds a digital signature only to Windows 8, then only this operating system will run on the tablet.

If the user wants to install an operating system on the Linux kernel, he will have to manually intervene in the firmware to add the signature. This is a complex procedure that not many will be able to do. If the manufacturer adds additional signatures on its own, Microsoft

Microsoft is trying to reduce competitive pressure from ARM tablets running Google's Android operating system. Currently, ARM devices occupy almost the entire global tablet market, and the vast majority of them work on Android or iOS operating systems, with the almost complete absence of Windows OS on the market. It can be assumed that Microsoft introduced a restriction on digital signatures in UEFI to prevent vendors and users from installing alternative operating systems on tablets designed for Windows 8 and sold with its logo. It is noteworthy that claims from the antimonopoly authorities regarding the requirements of Microsoft are unlikely to appear, just for the reason that it is almost absent on the market.

The story of UEFI blocking at the request of Microsoft did not begin today. Back in September 2011, representatives of Linux distributors sounded the alarm due to the fact that running third-party operating systems on computers with this technology would be very difficult. Within a month, they prepared a document with recommendations on how to organize the boot process at the system level, and in December the corporation canceled the mandatory condition according to which UEFI technology could not be disabled. However, this only applied to devices with x86 processors.

Thus, buyers of a modern Windows 8 tablet with long battery life and a Metro interface will find themselves in the same position as iPad owners: they will only be able to use the pre-installed operating system.

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