Black metal is an extreme subgenre of heavy metal music. Common traits include fast tempos, a shrieking vocal style, heavily distorted guitars played with tremolo picking, raw (lo-fi) recording, unconventional song structures, and an emphasis on atmosphere. Artists often appear in corpse paint and adopt pseudonyms.
Heavy metal may refer to:
An artificial cardiac pacemaker is a medical device, nowadays always implanted, that generates electrical pulses delivered by electrodes to one or more of the chambers of the heart, the upper atria or lower ventricles. Each pulse causes the targeted chamber(s) to contract and pump blood, thus regulating the function of the electrical conduction system of the heart.
Alternative music may refer to the following types of music:
Middle East Command, later Middle East Land Forces, was a British Army Command established prior to the Second World War in Egypt. Its primary role was to command British land forces and co-ordinate with the relevant naval and air commands to defend British interests in the Middle East and eastern Mediterranean region.
In electronics, a lead is an electrical connection consisting of a length of wire or a metal pad that is designed to connect two locations electrically. Leads are used for many purposes, including: transfer of power; testing of an electrical circuit to see if it is working, using a test light or a multimeter; transmitting information, as when the leads from an electrocardiograph are attached to a person's body to transmit information about their heart rhythm; and sometimes to act as a heatsink. The tiny leads coming off through-hole electronic components are also often called pins; in ball grid array packages, they are in form of small spheres, and are therefore called "balls".
The Tarkhan dynasty, was established by a Tarkhan and ruled Sindh, Pakistan from 1554 to 1591 AD. General Mirza Isa Beg founded the Tarkhan dynasty in Sindh after the death of Shah Husayn Arghun of the Arghun dynasty.
The 1N4148 is a standard silicon switching signal diode. It is one of the most popular and long-lived switching diodes because of its dependable specifications and low cost. Its name follows the JEDEC nomenclature. The 1N4148 is useful in switching applications up to about 100 MHz with a reverse-recovery time of no more than 4 ns.
Metal electrode leadless face (MELF) is a type of leadless cylindrical electronic surface mount device that is metallized at its ends. MELF devices are usually diodes and resistors.
Surface acoustic wave gas sensor or surface acoustic wave (SAW) sensors consist of an input transducer, a chemically adsorbent polymer film, and an output transducer on a piezoelectric substrate, which is typically quartz. The input transducer launches an acoustic wave that travels through the chemical film and is detected by the output transducer. SAW devices have been able to detect and distinguish between organophosphates, chlorinated hydrocarbons, ketones, alcohols, aromatic hydrocarbons, saturated hydrocarbons, and water. Such a device made at Sandia National Laboratories runs at a very high frequency, and the velocity and attenuation of the signal are sensitive to the viscoelasticity and mass of the thin film. The SAW device has four channels, each channel consisting of a transmitter and a receiver, separated by a small distance. Three of the four channels have a polymer deposited on the substrate between the transmitter and receiver. The purpose of the polymers is to adsorb chemicals of interest, with different polymers having different affinities for various chemicals. When a target chemical is adsorbed, the mass of the associated polymer increases, causing a slight change in phase of the acoustic signal relative to the reference (fourth) channel, which has no polymer. The SAW device also contains three Application Specific Integrated Circuit chips (ASICs), which contain the electronics to analyze the signals and output a DC voltage signal proportional to the phase shift. The SAW device, containing the transducers and ASICs, is bonded to a piece of quartz glass, which is placed in a leadless chip carrier (LCC). Wire bonds connect the terminals of the leadless chip carrier to the SAW circuits.
English as a lingua franca (ELF) is the use of the English language "as a global means of inter-community communication" and can be understood as "any use of English among speakers of different first languages for whom English is the communicative medium of choice and often the only option". ELF is "defined functionally by its use in intercultural communication rather than formally by its reference to native-speaker norms" whereas English as a second or foreign language aims at meeting native speaker norms and gives prominence to native-speaker cultural aspects. While lingua francas have been used for centuries, what makes ELF a novel phenomenon is the extent to which it is used in spoken, written and in computer-mediated communication. ELF research focuses on the pragmatics of variation which is manifest in the variable use of the resources of English for a wide range of globalized purposes, in important formal encounters such as business transactions, international diplomacy and conflict resolution, as well as in informal exchanges between international friends.
A QUADRAC is a special type of thyristor which combines a DIAC and a TRIAC in a single package. The DIAC is the triggering device for the TRIAC. Thyristors are four-layer (PNPN) semiconductor devices that act as switches, rectifiers or voltage regulators in a variety of applications. When triggered, thyristors turn on and become low-resistance current paths. They remain so even after the trigger is removed, and until the current is reduced to a certain level. Diacs are bi-directional diodes that switch AC voltages and trigger triacs or silicon-controlled rectifiers (SCRs). Except for a small leakage current, diacs do not conduct until the breakover voltage is reached. Triacs are three-terminal, silicon devices that function as two SCRs configured in an inverse, parallel arrangement. They provide load current during both halves of the AC supply voltage. By combining the functions of diacs and triacs, QUADRACs eliminate the need to buy and assemble discrete parts.
In electronics, a chip carrier is one of several kinds of surface-mount technology packages for integrated circuits. Connections are made on all four edges of a square package; compared to the internal cavity for mounting the integrated circuit, the package overall size is large.
Artifact of Evil is a 1986 fantasy novel by Gary Gygax, set in the world of Greyhawk, which is based on the Dungeons & Dragons fantasy role-playing game.
In microelectronics, a quad in-line package, is an electronic component package with a rectangular housing and four parallel rows of electrical connecting pins. The package may be through-hole mounted to a printed circuit board (PCB) or inserted in a socket. Rockwell used a QIP with 42 leads formed into staggered rows for their PPS-4 microprocessor family introduced in 1973, and other microprocessors and microcontrollers, some with higher lead counts, through the early 1990s.
Lithium battery may refer to:
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