Material Properties, Classification, and Processing
Classification of Materials
Materials can be broadly classified into three categories:
- Natural materials: Those found in nature.
- Artificial materials: Those made from natural materials found in nature but have not undergone prior processing.
- Synthetic materials: Man-made from artificial materials.
Material Properties
Sensory Properties
These properties relate to how a material interacts with our senses. For instance, garments made from natural products are often more pleasant to the touch, while synthetic
Read MoreTelevision and Video Recording Technologies: CRT, LCD, Plasma, VCR, DVD
Television: Cathode-Ray Tube (CRT)
A TV operates through an electronic process that converts electromagnetic waves into a quick sequence of images and sounds that replicate reality. The received signal contains information with different frequencies for color, light, and sound.
Traditional CRT-type TVs have a cathode-ray tube in which the received signal with the antenna creates a three-beam radiation of electrons. These are accelerated by the anode to the screen, covered with phosphorescent substances
Read MoreTypes of Network Cables: Twisted Pair, Coaxial, Fiber Optic
Twisted Pair Cable
Twisted pair cable consists of two conductors, usually copper, each with its own plastic insulation, twisted together. One of the cables carries signals to the receiver, and the other is used as a signal ground reference.
In addition to the signal sent by the sender, interference and noise can affect both cables and create unwanted signals. If the cables are parallel, the effect of these unwanted signals is not the same in both due to their different positions relative to noise
Read MoreMaterials Science: Properties, Testing, and Sustainability
Primary Networks and Subnetworks
Primary networks: Sets of wires connecting the substations with transformation substations.
Subnetworks: A set of cables connecting the substations of transformation with the rush of buildings.
Cogeneration
Cogeneration: Process of using the residual energy when producing electric or mechanical energy.
Cogeneration systems:
- Cogeneration using diesel cycle engine: Works like a standard diesel engine which has been coupled to an alternator to generate electricity.
- Through
Evolution of Computing and Cloud Computing FAQ
Historical Computing Trends
From 1960 to 1980, lower-cost minicomputers such as the DEC PDP 11 and VAX Series became popular among small businesses and on college campuses.
From 1970 to 1990, we saw widespread use of personal computers built with VLSI microprocessors. From 1980 to 2000, massive numbers of portable computers and pervasive devices appeared in both wired and wireless applications. Since 1990, the use of both High-Performance Computing (HPC) and High-Throughput Computing (HTC) systems
Read MoreAndroid Development: Key Components and Concepts
AndroidManifest.xml – Describe your app in this file; your app starts with the “main” method you declare here. You also need to declare all of your activities here.
Activity – An Activity is a Java controller class that typically corresponds to one screen in your app.
Fragment – A Fragment is a Java controller that typically corresponds to a widget in a screen (or possibly the full screen).
Intent – You launch new activities with Intents.
Service – Background services, like notifications.
R class