There are two types of LCD screens: passive-matrix and active-matrix. Passive matrix LCD screens arrange elements in rows and columns and activate them sequentially, which can cause ghosting. Active matrix LCD screens use transistors to independently control each element, allowing for higher quality images. Printers also come in impact and non-impact varieties. Impact printers like dot matrix printers work by striking pins against an inked ribbon. Non-impact printers like inkjet and laser printers work without physical contact by spraying or fusing tiny droplets of ink. Laser printers create electrostatic images on a drum using a laser beam.
This document provides an overview of different printer technologies. It discusses the basic principles of laser printers and inkjet printers. Laser printers use static electricity to transfer toner powder to paper to create the printed image, while inkjet printers use thermal bubble or piezoelectric mechanisms to spray ink droplets. The document also describes various printer components like photoreceptors, toner, and fusers, and how they work together in the printing process.
The document discusses different types of printers including inkjet printers, laser printers, dot matrix printers, and daisy wheel printers. It describes the basic operation of each type of printer, their advantages and disadvantages, and provides a brief history of printer development. Key points covered include how dot matrix printers form characters using pins, the laser scanning and toner transfer process used in laser printers, and that inkjet and laser printers now produce higher quality output than earlier printer technologies.
The document discusses different types of printers including their key characteristics and functioning. It describes dot matrix printers, inkjet printers, and laser printers. Dot matrix printers work by striking the page with pins to form characters and can be classified based on the number of pins, characters per second, and interface. Inkjet printers work by spraying tiny droplets of ink onto paper and laser printers use a process of cleaning, charging, writing, developing, transferring, and fusing toner onto paper using heat.
Printers are output devices that produce hard copies of computer information. There are two main categories of printers: impact printers and non-impact printers. Impact printers like dot matrix printers work like typewriters by striking pins against the paper, while non-impact printers like inkjet printers spray ink directly onto paper without touching it. Laser printers are fast non-impact printers that use a laser beam to form an image on a drum and transfer toner powder onto paper to print.
Vansh Raj Solanki is requesting a presentation on printers for class VII A. The document then summarizes different types of printers including dot matrix printers, which use pins to print individual characters; daisy wheel printers, which use print wheels resembling daisies to produce typewriter-quality text; line printers, which can print entire lines at once; drum printers, which use rotating drums coated with characters; and chain printers, which use rotating chains coated with characters. It also discusses non-impact printers such as inkjet printers, which spray ink droplets onto paper, and laser printers, which use laser beams to transfer toner onto paper.
1. The document discusses various input and output devices used in computing including keyboards, mice, joysticks, scanners, light pens, trackballs, touch screens, monitors, and printers.
2. Input devices allow users to enter data into computers through typing, pointing, speaking, or scanning. Output devices display or print information from computers in visual or physical forms.
3. Monitors are the main visual output device and include CRT, LCD, LED, and flat screen variants. Printers provide physical printouts and include impact printers like dot matrix and daisy wheel, as well as non-impact printers like inkjet and laser printers.
This document discusses printers and scanners. It defines printers as output devices and describes different types of printers including laser printers, inkjet printers, and dot matrix printers. It also discusses factors to consider when choosing a printer and how to install and share a printer. The document then defines scanners as input devices and describes types of scanners like flatbed scanners and barcode scanners. It also discusses optical character recognition and mark recognition devices.
This document provides an overview of different printer technologies. It discusses the basic principles of laser printers and inkjet printers. Laser printers use static electricity to transfer toner powder to paper to create the printed image, while inkjet printers use thermal bubble or piezoelectric mechanisms to spray ink droplets. The document also describes various printer components like photoreceptors, toner, and fusers, and how they work together in the printing process.
The document discusses different types of printers including inkjet printers, laser printers, dot matrix printers, and daisy wheel printers. It describes the basic operation of each type of printer, their advantages and disadvantages, and provides a brief history of printer development. Key points covered include how dot matrix printers form characters using pins, the laser scanning and toner transfer process used in laser printers, and that inkjet and laser printers now produce higher quality output than earlier printer technologies.
The document discusses different types of printers including their key characteristics and functioning. It describes dot matrix printers, inkjet printers, and laser printers. Dot matrix printers work by striking the page with pins to form characters and can be classified based on the number of pins, characters per second, and interface. Inkjet printers work by spraying tiny droplets of ink onto paper and laser printers use a process of cleaning, charging, writing, developing, transferring, and fusing toner onto paper using heat.
Printers are output devices that produce hard copies of computer information. There are two main categories of printers: impact printers and non-impact printers. Impact printers like dot matrix printers work like typewriters by striking pins against the paper, while non-impact printers like inkjet printers spray ink directly onto paper without touching it. Laser printers are fast non-impact printers that use a laser beam to form an image on a drum and transfer toner powder onto paper to print.
Vansh Raj Solanki is requesting a presentation on printers for class VII A. The document then summarizes different types of printers including dot matrix printers, which use pins to print individual characters; daisy wheel printers, which use print wheels resembling daisies to produce typewriter-quality text; line printers, which can print entire lines at once; drum printers, which use rotating drums coated with characters; and chain printers, which use rotating chains coated with characters. It also discusses non-impact printers such as inkjet printers, which spray ink droplets onto paper, and laser printers, which use laser beams to transfer toner onto paper.
1. The document discusses various input and output devices used in computing including keyboards, mice, joysticks, scanners, light pens, trackballs, touch screens, monitors, and printers.
2. Input devices allow users to enter data into computers through typing, pointing, speaking, or scanning. Output devices display or print information from computers in visual or physical forms.
3. Monitors are the main visual output device and include CRT, LCD, LED, and flat screen variants. Printers provide physical printouts and include impact printers like dot matrix and daisy wheel, as well as non-impact printers like inkjet and laser printers.
This document discusses printers and scanners. It defines printers as output devices and describes different types of printers including laser printers, inkjet printers, and dot matrix printers. It also discusses factors to consider when choosing a printer and how to install and share a printer. The document then defines scanners as input devices and describes types of scanners like flatbed scanners and barcode scanners. It also discusses optical character recognition and mark recognition devices.
A printer is a hardware device that takes electronic data from a computer and prints it onto paper. There are different types of printers categorized as either impact printers like daisy wheel printers that use a spinning disk to imprint characters, or non-impact printers like inkjet printers that spray ink onto paper and laser printers that use toner. Key qualities of printers are color capability, resolution, speed, and memory. New printing technologies may include inkless printing and 3D printing.
There are two main types of printers: impact printers and non-impact printers. Impact printers work by physically striking an inked ribbon against the paper, and include dot-matrix, daisy wheel, drum, chain, and band printers. Non-impact printers do not physically strike the paper, and include inkjet printers which spray ink onto paper, and laser printers which use a laser beam to attract toner onto the paper to form images. Dot matrix printers use print heads with pins that form characters by striking individual dots, while laser printers use a laser beam and toner to efficiently print high quality pages at speeds up to 437 pages per minute.
The printer is a computer peripheral that accepts text and graphics as input and prints them on paper. There are four main types of printers: impact, inkjet, laser, and plotters. Impact printers such as dot matrix printers work by striking pins against an ink ribbon to print characters. Inkjet printers spray ink through nozzles onto paper. Laser printers use static electricity and toner to transfer an image onto paper. Plotters are large printers used for technical drawings.
The printer is a computer peripheral that accepts text and graphics as input and prints them on paper. There are four main types of printers: impact, inkjet, laser, and plotters. Impact printers such as dot matrix printers work by striking pins against an ink ribbon to print characters. Inkjet printers spray ink through nozzles onto paper. Laser printers use static electricity and toner to transfer an image onto paper. Plotters are large printers used for technical drawings.
The document discusses different types of printers including dot matrix, inkjet, and laser printers. It provides details on their working mechanisms and components. Dot matrix printers use pins to print characters and can print low-quality text. Inkjet printers use heated resistors to vaporize ink into droplets for printing. Laser printers use a laser beam to selectively charge a photoconductive drum before ink is deposited to produce very high-quality output. Advantages and disadvantages of each type are also outlined.
Impact printers work by physically striking an ink ribbon to transfer characters to paper while non-impact printers like inkjet and laser printers avoid physical contact. Dot matrix printers use rows of pins to form characters as ink is transferred to paper. Laser printers use toner powder and heat to fuse characters onto paper at high speeds. The type of printer chosen depends on factors such as output volume, quality needs, location, and whether color or copies are required.
The document discusses various types of computer output devices. It describes printers such as dot matrix, inkjet, and laser printers. It also mentions plotters, computer output microfilm, monitors, voice response systems, and projectors. It provides details on the functioning and use of different printers and how they produce hard and soft copy output.
Dot matrix, inkjet, and laser printers are the three main types of printers. Dot matrix printers work by using pins to impact ink onto paper in a dot matrix pattern, producing lower quality text-only output. Inkjet printers spray tiny droplets of ink through nozzles onto paper to produce higher quality color or black and white output. Laser printers use a laser beam to electrically charge a drum, which is then coated with toner to create the printed image, producing very high quality text and graphics output. Each type has advantages and disadvantages related to cost, speed, quality, noise, and durability.
The document summarizes the components and functioning of an HP Deskjet 3325 inkjet printer. It describes how inkjet printers work by firing droplets of ink onto paper to form images. It then lists the key components of the HP 3325 printer, including plastic encoders, belts, LED lights, ink cartridges, casing, motors, gears, sensors, and circuit boards. It provides details on how these components work together to print documents sent from a connected computer.
The document discusses various printer types including dot-matrix printers, inkjet printers, and laser printers. It describes the key components and functions of each printer type, how to install and troubleshoot issues, and identifies other less common printer technologies.
An output device is any device that sends data from a computer to another device or user. Output devices relay the computer's response visually. There are two main types of output devices: display devices and printers. Display devices like monitors use technologies like LCD, LED, and plasma to output visual information. Printers output information onto paper and can be either impact printers that use ink ribbons, like dot matrix printers, or non-impact printers like inkjet and laser printers.
This document defines a printer as a peripheral that produces a physical representation of an electronic document. It discusses two categories of printers: impact and non-impact. Impact printers rely on forcibly impacting an ink ribbon against paper to print. Examples given are dot matrix, drum, daisy wheel, and chain printers. The document outlines the advantages of impact printers being inexpensive and energy efficient, and the disadvantages being noisy, low resolution, limited fonts, and poor graphics.
The document discusses various types of output devices used in business, including monitors, printers, and plotters. It describes the key characteristics and technologies of CRT and LCD monitors, dot matrix, inkjet, and laser printers, and photo and multifunction printers. Other output devices mentioned include headphones, earbuds, and data projectors. Printers are categorized as either impact printers that use pins to transfer ink to paper, or non-impact printers like inkjet and laser printers that use other methods to place ink on pages.
A printer is an external output device that takes data from a computer and generates output in the form of graphics/text on a paper.
There are two types of printers.
Impact printers
Non-Impact printers
This document summarizes different types of printers and their features. It discusses inkjet printers, laser printers, thermal printers, and impact printers. For each type, it provides details on components, printing processes, advantages, and disadvantages in 1-3 sentences. Common connection types like serial, parallel, USB, and Ethernet are also summarized briefly.
This document discusses different types of computer output hardware. It describes monitors, including CRT, LCD, and plasma monitors. It discusses the advantages and disadvantages of each type. It also covers data projectors, printers including impact (dot matrix, character, line) and non-impact (inkjet, laser) printers. Finally, it briefly mentions plotters and speakers.
This document provides an overview of different types of printers and plotters. It discusses the basic functions and workings of common printer types like inkjet printers, laser printers, and dot matrix printers. It also covers special printers like photo printers, portable printers, and dye sublimation printers. The document concludes by defining plotters and describing the three main types: drum plotters, flatbed plotters, and inkjet plotters.
Printers convert electronic documents into physical form by transferring text and graphics onto paper. There are two main categories of printers: impact printers that use mechanisms like pins to strike ink onto paper, and non-impact printers that use other methods like inkjet or laser printing. When evaluating printers, considerations include image quality, speed, initial cost, and operating costs of supplies. Common printer types include dot matrix, inkjet, and laser printers that vary in performance and cost. Plotters are specialized printers used for vector graphics that work by moving pens across paper.
This document discusses backpropagation algorithms for neural networks. It explains that backpropagation aims to optimize neural network weights so the network can learn to map inputs to correct outputs. As an example, it provides a single training set with inputs of 0.05 and 0.10 mapped to outputs of 0.01 and 0.99 respectively. It also references error functions, the forward pass through the network, and the logistic function.
A multilayer neural network contains an input layer, two or more hidden layers, and an output layer. Information flows from the input nodes to the first hidden layer, then between subsequent hidden layers, and finally to the output layer. Multilayer networks can represent complex decision boundaries and functions through their multiple layers of nodes. They are trained using backpropagation, which calculates error signals starting from the output layer and propagates these errors back through the network to update weights between layers. This process of forward activation and backward error propagation is repeated over many iterations to gradually adjust the weights and minimize errors.
A printer is a hardware device that takes electronic data from a computer and prints it onto paper. There are different types of printers categorized as either impact printers like daisy wheel printers that use a spinning disk to imprint characters, or non-impact printers like inkjet printers that spray ink onto paper and laser printers that use toner. Key qualities of printers are color capability, resolution, speed, and memory. New printing technologies may include inkless printing and 3D printing.
There are two main types of printers: impact printers and non-impact printers. Impact printers work by physically striking an inked ribbon against the paper, and include dot-matrix, daisy wheel, drum, chain, and band printers. Non-impact printers do not physically strike the paper, and include inkjet printers which spray ink onto paper, and laser printers which use a laser beam to attract toner onto the paper to form images. Dot matrix printers use print heads with pins that form characters by striking individual dots, while laser printers use a laser beam and toner to efficiently print high quality pages at speeds up to 437 pages per minute.
The printer is a computer peripheral that accepts text and graphics as input and prints them on paper. There are four main types of printers: impact, inkjet, laser, and plotters. Impact printers such as dot matrix printers work by striking pins against an ink ribbon to print characters. Inkjet printers spray ink through nozzles onto paper. Laser printers use static electricity and toner to transfer an image onto paper. Plotters are large printers used for technical drawings.
The printer is a computer peripheral that accepts text and graphics as input and prints them on paper. There are four main types of printers: impact, inkjet, laser, and plotters. Impact printers such as dot matrix printers work by striking pins against an ink ribbon to print characters. Inkjet printers spray ink through nozzles onto paper. Laser printers use static electricity and toner to transfer an image onto paper. Plotters are large printers used for technical drawings.
The document discusses different types of printers including dot matrix, inkjet, and laser printers. It provides details on their working mechanisms and components. Dot matrix printers use pins to print characters and can print low-quality text. Inkjet printers use heated resistors to vaporize ink into droplets for printing. Laser printers use a laser beam to selectively charge a photoconductive drum before ink is deposited to produce very high-quality output. Advantages and disadvantages of each type are also outlined.
Impact printers work by physically striking an ink ribbon to transfer characters to paper while non-impact printers like inkjet and laser printers avoid physical contact. Dot matrix printers use rows of pins to form characters as ink is transferred to paper. Laser printers use toner powder and heat to fuse characters onto paper at high speeds. The type of printer chosen depends on factors such as output volume, quality needs, location, and whether color or copies are required.
The document discusses various types of computer output devices. It describes printers such as dot matrix, inkjet, and laser printers. It also mentions plotters, computer output microfilm, monitors, voice response systems, and projectors. It provides details on the functioning and use of different printers and how they produce hard and soft copy output.
Dot matrix, inkjet, and laser printers are the three main types of printers. Dot matrix printers work by using pins to impact ink onto paper in a dot matrix pattern, producing lower quality text-only output. Inkjet printers spray tiny droplets of ink through nozzles onto paper to produce higher quality color or black and white output. Laser printers use a laser beam to electrically charge a drum, which is then coated with toner to create the printed image, producing very high quality text and graphics output. Each type has advantages and disadvantages related to cost, speed, quality, noise, and durability.
The document summarizes the components and functioning of an HP Deskjet 3325 inkjet printer. It describes how inkjet printers work by firing droplets of ink onto paper to form images. It then lists the key components of the HP 3325 printer, including plastic encoders, belts, LED lights, ink cartridges, casing, motors, gears, sensors, and circuit boards. It provides details on how these components work together to print documents sent from a connected computer.
The document discusses various printer types including dot-matrix printers, inkjet printers, and laser printers. It describes the key components and functions of each printer type, how to install and troubleshoot issues, and identifies other less common printer technologies.
An output device is any device that sends data from a computer to another device or user. Output devices relay the computer's response visually. There are two main types of output devices: display devices and printers. Display devices like monitors use technologies like LCD, LED, and plasma to output visual information. Printers output information onto paper and can be either impact printers that use ink ribbons, like dot matrix printers, or non-impact printers like inkjet and laser printers.
This document defines a printer as a peripheral that produces a physical representation of an electronic document. It discusses two categories of printers: impact and non-impact. Impact printers rely on forcibly impacting an ink ribbon against paper to print. Examples given are dot matrix, drum, daisy wheel, and chain printers. The document outlines the advantages of impact printers being inexpensive and energy efficient, and the disadvantages being noisy, low resolution, limited fonts, and poor graphics.
The document discusses various types of output devices used in business, including monitors, printers, and plotters. It describes the key characteristics and technologies of CRT and LCD monitors, dot matrix, inkjet, and laser printers, and photo and multifunction printers. Other output devices mentioned include headphones, earbuds, and data projectors. Printers are categorized as either impact printers that use pins to transfer ink to paper, or non-impact printers like inkjet and laser printers that use other methods to place ink on pages.
A printer is an external output device that takes data from a computer and generates output in the form of graphics/text on a paper.
There are two types of printers.
Impact printers
Non-Impact printers
This document summarizes different types of printers and their features. It discusses inkjet printers, laser printers, thermal printers, and impact printers. For each type, it provides details on components, printing processes, advantages, and disadvantages in 1-3 sentences. Common connection types like serial, parallel, USB, and Ethernet are also summarized briefly.
This document discusses different types of computer output hardware. It describes monitors, including CRT, LCD, and plasma monitors. It discusses the advantages and disadvantages of each type. It also covers data projectors, printers including impact (dot matrix, character, line) and non-impact (inkjet, laser) printers. Finally, it briefly mentions plotters and speakers.
This document provides an overview of different types of printers and plotters. It discusses the basic functions and workings of common printer types like inkjet printers, laser printers, and dot matrix printers. It also covers special printers like photo printers, portable printers, and dye sublimation printers. The document concludes by defining plotters and describing the three main types: drum plotters, flatbed plotters, and inkjet plotters.
Printers convert electronic documents into physical form by transferring text and graphics onto paper. There are two main categories of printers: impact printers that use mechanisms like pins to strike ink onto paper, and non-impact printers that use other methods like inkjet or laser printing. When evaluating printers, considerations include image quality, speed, initial cost, and operating costs of supplies. Common printer types include dot matrix, inkjet, and laser printers that vary in performance and cost. Plotters are specialized printers used for vector graphics that work by moving pens across paper.
This document discusses backpropagation algorithms for neural networks. It explains that backpropagation aims to optimize neural network weights so the network can learn to map inputs to correct outputs. As an example, it provides a single training set with inputs of 0.05 and 0.10 mapped to outputs of 0.01 and 0.99 respectively. It also references error functions, the forward pass through the network, and the logistic function.
A multilayer neural network contains an input layer, two or more hidden layers, and an output layer. Information flows from the input nodes to the first hidden layer, then between subsequent hidden layers, and finally to the output layer. Multilayer networks can represent complex decision boundaries and functions through their multiple layers of nodes. They are trained using backpropagation, which calculates error signals starting from the output layer and propagates these errors back through the network to update weights between layers. This process of forward activation and backward error propagation is repeated over many iterations to gradually adjust the weights and minimize errors.
The document discusses several key concepts in machine learning including reinforcement learning, evolutionary learning, features, training/test/validation sets, overfitting, underfitting, and clustering. Reinforcement learning involves training an agent through rewards/punishments without being directly told what to do. Evolutionary learning follows biological evolution principles of inheritance, variation, and selection. Features represent attributes of an object encoded in a vector. Training/test/validation sets are used to develop and evaluate models. Overfitting and underfitting refer to models fitting the training data too closely or not closely enough, respectively. Clustering groups similar objects together.
This document provides an overview of machine learning. It defines machine learning as a computer program that improves its performance at tasks through experience. The document discusses different types of machine learning including supervised learning, unsupervised learning, reinforcement learning, and evolutionary learning. It also defines important machine learning concepts such as regression, classification, and clustering. Examples are provided to illustrate these machine learning techniques.
The document discusses the limitations of perceptrons and how multilayer perceptrons can solve more complex problems. It explains that while a single perceptron can only learn linearly separable problems, multilayer perceptrons using techniques like backpropagation can learn nonlinear and more complex relationships. The document also provides information on decision boundaries and feature vectors, and how multilayer perceptrons are able to learn problems with nonlinear decision boundaries. Machine learning concepts like learning, training from data, and the growth of data are also briefly covered.
This document discusses neural networks and how they can be trained. It covers several key points:
- Neural networks are assemblies of simple processing units (McCulloch-Pitts neurons) that can perform any computation when connected together and having their weights solved for.
- Training neural networks involves adapting the weights to minimize error between the network's actual and desired outputs on a training set, using a learning rule.
- A simple perceptron network has weights that are adjusted based on the difference between the desired and actual outputs, proportional to a learning rate.
- Bias inputs and weights allow the network to function when all other inputs are zero, replacing the need for an adjustable threshold parameter.
This document discusses neural networks and the biological structures they are inspired by. It contains the following key points:
- Neurons are the fundamental units of the brain and nervous system, receiving sensory input and sending motor commands. A neuron has dendrites that receive input, an axon that sends output signals, and a cell body with DNA.
- McCulloch and Pitts designed one of the first neural networks in 1943, with simplified neuron models that sum weighted inputs and fire if the threshold is reached.
- Hebb's rule describes how the connection between neurons is strengthened when one neuron repeatedly helps cause the other to fire.
- Neural networks are biologically inspired but also have limitations compared to real
Amplifiers and biopotential amplifiers newM. Raihan
What is Amplifiers?
Classification of Amplifiers
Based on number of stages
Single-stage Amplifier
Based on its output
ased on the input signals
Based on the frequency range
Based on the Coupling method
Based on the Transistor
Configuration
CE amplifier
CC amplifier
Comparaison between CB, CE
and CC Amplifies
Noise in Amplifier
Signal to Noise Ratio (SNR)
Biopotential Amplifiers
Typical bio-amplifier requirements
Voltage and Frequency
Range for Biopotentials
Electrocardiograph Amplifiers
Interference Reduction Techniques
Comparison of fnir with other neuroimaging modalities relation between eeg sy...M. Raihan
The document discusses neuroimaging techniques such as functional near-infrared spectroscopy (fNIRS). fNIRS uses near-infrared light to monitor changes in oxygenated and deoxygenated hemoglobin in the brain in response to neural activity. It provides a portable, low-cost way to monitor brain activity and oxygenation levels during cognitive tasks. The document discusses how fNIRS works, its applications in detecting brain activity and lie detection by measuring hemodynamic responses in the prefrontal cortex. It also compares fNIRS to other neuroimaging techniques such as fMRI and discusses its potential for use in brain-computer interfaces.
The document discusses modern CPUs and their specifications. It provides details about AMD and Intel CPUs including their core counts, clock speeds, thermal designs and cache sizes. It also covers CPU architecture types like RISC and CISC. Additional topics covered include microprocessors, hardware components, operating systems like DOS and GUI, computer buses and USB standards.
This document discusses various data representation techniques including excess-3 code, Gray code, binary coded decimal, ASCII, EBCDIC, Unicode, and logic gates. Excess-3 code represents each decimal number as a binary number in excess of three. Gray code ensures each code differs from its neighbor by one bit. ASCII and EBCDIC are character encoding standards that allow representation of text. Unicode supports encoding for many languages. The document also describes logic gates like AND, OR, NOT, XOR, and how logic expressions can be represented using gates.
A bit is the smallest unit of data that can represent either a 1 or 0. Eight bits form a byte, which can represent one character. Common units for data storage are bytes, kilobytes, megabytes and gigabytes. There are different number systems used to represent numeric values in computing, including binary, octal and hexadecimal. Binary numbers can be added, subtracted and multiplied using logic gates. Decimal numbers can be converted to their binary or octal equivalent through repeated division and obtaining remainders.
The document discusses different ways of representing numeric data in computing systems. It covers external representation using symbols like letters and numbers, and internal representation using binary digits (0s and 1s). Numeric data is categorized as integer or real numbers, and further as signed or unsigned values. Different number systems like binary, octal, decimal, and hexadecimal are explained, along with how values are represented and converted between these systems using place value and arithmetic operations on the base of each system. Conversion examples are provided between decimal, binary, octal, and hexadecimal numbers.
The document discusses different types of computer output devices. It describes monitors, printers, 3D printers, braille readers, GPS devices, plotters, headphones, projectors, sound cards, video cards, and different types of displays including CRT displays and LCD monitors. It provides details on what each device is and how it functions, as well as advantages and disadvantages of CRT and LCD displays.
The document discusses various input devices used in computers. It describes keyboards, mice, joysticks, light pens, trackballs, scanners, graphics tablets, microphones, magnetic ink card readers, optical character readers, optical mark readers, bar code readers, and webcams. For each device, it provides details on what it is and how it functions to input data into a computer. The keyboard section contains the most detail, breaking down its different types of keys and their purposes.
An information system is a group of components that collect, organize, store, and communicate information to help organizations operate, manage their resources, and compete in the marketplace. There are different types of information systems that support various organizational levels, including transaction processing systems, office automation systems, knowledge work systems, management information systems, decision support systems, and executive support systems. The systems development life cycle is the process used to plan, create, test, and deploy information systems and includes steps like system planning, analysis, design, implementation, testing, and maintenance.
The document discusses various topics related to online work and e-commerce. It begins by describing different types of internet connections like dial-up, DSL, cable, satellite, and mobile. It then discusses the hardware needed like modems and routers. It provides definitions and examples of different types of e-commerce like B2B, B2C, C2C, C2B, B2A, and C2A. The advantages of e-commerce are described as reaching a global market, shortening distribution chains, increased productivity and competitiveness for businesses, and cost reduction. The disadvantages are strong dependence on technology, lack of adequate legislation, consumer reluctance, privacy and identity issues, and security concerns.
Bitmap images store color information for each individual pixel arranged in a pattern, while vector images use mathematical formulas to draw lines and curves. Bitmaps can be edited by changing pixel colors, while vectors are edited by manipulating lines and curves. Vector images tend to be smaller files since they just store formulas rather than individual pixel data.
Graphics software allows users to manipulate images on a computer and can be categorized as raster or vector based. Common software includes paint programs for photo editing, draw programs, and CAD for design. Word processors, publishing software, illustration programs, and presentation software allow combining text and graphics. Clip art contains images that can be imported, while multimedia integrates various media types into an interactive experience.
The document provides an overview of the internet and its key components. It discusses how the internet originated from the ARPANET project in 1968 and evolved to become a global system of interconnected computer networks using TCP/IP. The key elements that enable the internet are described, including protocols like TCP and IP, packets, routers, domain names, HTML, email and the World Wide Web. Common internet services like file transfer, communication tools, information retrieval and e-commerce are also summarized. Connection types, firewalls and other networking concepts are briefly covered as well.
Productivity software includes programs that help users create documents, spreadsheets, presentations, and databases. Examples include word processors, spreadsheet applications like Excel, and database management systems. Word processors allow editing documents and changing formats. Spreadsheets organize and calculate data in rows and columns, and are useful for tasks like tracking finances, grades, lists, and stats. Database management systems help users create and manage databases to store and retrieve information. Productivity software can be obtained through commercial purchases, shareware, freeware, or as open source code.
LAND USE LAND COVER AND NDVI OF MIRZAPUR DISTRICT, UPRAHUL
This Dissertation explores the particular circumstances of Mirzapur, a region located in the
core of India. Mirzapur, with its varied terrains and abundant biodiversity, offers an optimal
environment for investigating the changes in vegetation cover dynamics. Our study utilizes
advanced technologies such as GIS (Geographic Information Systems) and Remote sensing to
analyze the transformations that have taken place over the course of a decade.
The complex relationship between human activities and the environment has been the focus
of extensive research and worry. As the global community grapples with swift urbanization,
population expansion, and economic progress, the effects on natural ecosystems are becoming
more evident. A crucial element of this impact is the alteration of vegetation cover, which plays a
significant role in maintaining the ecological equilibrium of our planet.Land serves as the foundation for all human activities and provides the necessary materials for
these activities. As the most crucial natural resource, its utilization by humans results in different
'Land uses,' which are determined by both human activities and the physical characteristics of the
land.
The utilization of land is impacted by human needs and environmental factors. In countries
like India, rapid population growth and the emphasis on extensive resource exploitation can lead
to significant land degradation, adversely affecting the region's land cover.
Therefore, human intervention has significantly influenced land use patterns over many
centuries, evolving its structure over time and space. In the present era, these changes have
accelerated due to factors such as agriculture and urbanization. Information regarding land use and
cover is essential for various planning and management tasks related to the Earth's surface,
providing crucial environmental data for scientific, resource management, policy purposes, and
diverse human activities.
Accurate understanding of land use and cover is imperative for the development planning
of any area. Consequently, a wide range of professionals, including earth system scientists, land
and water managers, and urban planners, are interested in obtaining data on land use and cover
changes, conversion trends, and other related patterns. The spatial dimensions of land use and
cover support policymakers and scientists in making well-informed decisions, as alterations in
these patterns indicate shifts in economic and social conditions. Monitoring such changes with the
help of Advanced technologies like Remote Sensing and Geographic Information Systems is
crucial for coordinated efforts across different administrative levels. Advanced technologies like
Remote Sensing and Geographic Information Systems
9
Changes in vegetation cover refer to variations in the distribution, composition, and overall
structure of plant communities across different temporal and spatial scales. These changes can
occur natural.
A workshop hosted by the South African Journal of Science aimed at postgraduate students and early career researchers with little or no experience in writing and publishing journal articles.
How to Setup Warehouse & Location in Odoo 17 InventoryCeline George
In this slide, we'll explore how to set up warehouses and locations in Odoo 17 Inventory. This will help us manage our stock effectively, track inventory levels, and streamline warehouse operations.
How to Fix the Import Error in the Odoo 17Celine George
An import error occurs when a program fails to import a module or library, disrupting its execution. In languages like Python, this issue arises when the specified module cannot be found or accessed, hindering the program's functionality. Resolving import errors is crucial for maintaining smooth software operation and uninterrupted development processes.
it describes the bony anatomy including the femoral head , acetabulum, labrum . also discusses the capsule , ligaments . muscle that act on the hip joint and the range of motion are outlined. factors affecting hip joint stability and weight transmission through the joint are summarized.
3. Types of LCD
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LCD element form the pixels in LCD screen.
The LCD elements are switched on and off by different techniques to
display an image on the screen.
There are two types of LCD screens: passive-matrix and active-matrix.
4. Passive Matrix LCD
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Each LCD element in placed between two electrodes
and arranged in rows and columns in X-Y matrix
format.
The bottom electrodes of each row elements are
connected together and the top electrodes of each
column elements are connected together.
The elements in a row are controlled by a row-driver
and the elements in a column by a column-driver.
Activating a row-driver and a column driver results in
a current through a specific LCD element.
5. Passive Matrix LCD (continue)
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An image is created on the screen by activating a row
driver and activating the column drivers in sequence like
scanning a line.
The drawback of this simple design is that if a current
through a cell is large, then adjacent elements, often those
in the same column, also get affected and this results in
ghosting.
If the current through an element is too weak, the
elements don’t switch on and off very quickly which results
in poor contrast and losing detail in moving images.
The dual scan technique improves the performance.
6. Active matrix LCD
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AMLCDs use one transistor driver for each LCD element.
The transistors are arranged in the matrix format.
It allows the current through individual elements to be switched on
and off quickly with sufficient current to get good contrast.
The electrodes for active matrix panels are also made of the
transparent material.
The transistor drivers are fabricated right on the panel substrate,
using thin film technology.
As the transistors are able to switch the elements more rapidly than
the passive matrix scheme and adjacent elements are not affected,
large currents can be used without ghosting.
The higher currents provide higher contrast and sharper and
brighter images.
7. Techniques for solving
Viewing Angle Problem
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The simplest technique uses a diffusing film on the top layer of the
display.
It causes the light traveling in specific direction to divert in different directions.
In the second technique, instead of passing the current from top
through the liquid crystal to bottom
The electrodes are arranged in such a way that the current flows from side to side.
It causes the molecules to align in horizontal direction, which results in wider viewing
angles.
In the third technique, each liquid crystal element is divided into
multiple regions
The substrate is pre-tilt in different directions so that the molecules align in different
directions.
It causes the light to emerge different directions, which results in wider viewing angles.
8. Printer
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Printers are the primary output devices used to prepare
permanent documents for human use.
Printing output is called hard copy output.
There are two types of printers −
Impact Printers
Non-Impact Printers
Three different types of printers are in use today. They are-
Dot-Matrix printer
Ink-Jet printer and
Laser-Jet printer
9. Impact Printers
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Impact printers print the characters by striking them on
the ribbon, which is then pressed on the paper.
These printers are of two types-
Character printers (Dot Matrix Printer(DMP), Daisy Wheel)
Line printers (Drum Printer, Chain Printer)
Characteristics of Impact Printers-
Very low consumable costs
Very noisy
Useful for bulk printing due to low cost
There is physical contact with the paper to produce an image
10. Non-impact Printers
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Non-impact printers print the characters without using
the ribbon. These printers print a complete page at a time,
thus they are also called as Page Printers.
These printers are of two types-
Laser Printers
Inkjet Printers
Characteristics of Non-impact Printers-
Faster than impact printers
They are not noisy
High quality
11. Dot-Matrix Printer
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A dot matrix printer has a printer head, which contains an array
of 7, 9, 14, 18 or 24 pins arranged in a vertical column.
While printing, the pins forming one column of dot pattern of
the character matrix project from the print head and press the
inked ribbon against a plain paper.
Only one column of dot pattern of character matrix is printed at
a time.
As the print head moves across the line, series of vertical dot
patterns representing the character are retrieved from the
printer’s internal memory and printed.
13. Dot-Matrix Printer (continue)
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The print head is mounted on a carriage and
moved back and forth along a rail by a belt.
The dot-matrix printers receive stream of
character from the computer, convert to series of
column of dot patterns and print.
The print quality depends on the number of pins
provided on the print head.
24-pin printers produce high quality printouts.
14. Ink-Jet Printer
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The operation of the ink-jet printer is similar to that of a
dot-matrix printer.
Ink-jet printers have tiny nozzles on the print head that
spray ionized ink onto a plain paper in the pattern to form
the characters and images.
The print head cartridge has 50 or more nozzles and is
mounted on a carriage that is carried back and forth along
a rail by a belt that is driven by a motor.
The print head is connected to the electronic control unit
through a long, flat, flexible print head cable.
16. Ink-Jet Printer (continue)
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When the PC sends a character to be printed, a series of vertical dot patterns representing
the character is retrieved from the printer’s internal memory and sent through a series of
print nozzle driver circuits.
The driver amplifies the signals into the fast, high-energy pulses needed to fire minute
droplets of ink from each nozzle.
As the pulse reaches the nozzle, it creates an intense surge of heat that literally creates a
bubble.
The nozzle cools down in a fraction of a second and becomes ready for another pulse.
The print quality of ink-jet printer depends on the quality of paper also.
They require periodic maintenance, as they use liquid ink.
The ink may dry in the nozzles and clog them.
17. Laser-jet printer
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Laser-jet printers function like a plain paper copier.
While a bright light source is used in a plain paper copier
for generating the images, a laser is used in laser printer.
The laser printer creates an electrostatic image of a text or
graphics page on a photosensitive drum using the laser
beam.
When the drum is moved across the toner, it attracts the
toner particles and deposits on the electrostatic image.
19. Laser-jet printer (continue)
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The drum is then pressed against a plain paper to transfer the
image on to the paper.
The paper is then passed between hot rollers to fuse the toner
particles into the paper.
The area of the drum is the same as that of the paper onto which
the image is transferred.
Every point on the drum corresponds to a point on the paper.
Laser printers are very popular today because of their print
quality and relatively low running cost.
The print quality is less sensitive to paper quality.
20. Laser-jet printer (continue)
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Laser printers get all the information about
the page to be printed and keep them in their
internal memory before starting the printing.
The amount of memory present in a printer
determines its capability.
21. Daisy Wheel Printer
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Head is lying on a wheel and pins corresponding to characters are like petals
of Daisy (flower) which is why it is called Daisy Wheel Printer.
These printers are generally used for word-processing in offices that require
a few letters to be sent here and there with very nice quality.
Advantages:
More reliable than Dot Matrix Printer (DMP)
Better quality
Fonts of character can be easily changed
Disadvantages:
Slower than DMP
Noisy
More expensive than DMP
23. Line Printers
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The line printer is an impact printer that prints one
entire line of text at a time.
It is mostly associated with unit record equipment and
the early days of digital computing, but the technology is
still in use.
Line printers are of two types −
Drum Printer
Chain Printer
24. Drum Printer
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This printer is like a drum in shape hence it is called drum printer. The
surface of the drum is divided into a number of tracks. Total tracks are equal
to the size of the paper, i.e. for a paper width of 132 characters, drum will have
132 tracks.
Different character sets available in the market are 48 character set, 64 and
96 characters set.
Drum printers are fast in speed and can print 300 to 2000 lines per minute.
Advantages:
Very high speed
Disadvantages:
Very expensive
Characters fonts cannot be changed
26. Chain Printer
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In this printer, a chain of character sets is used,
hence it is called Chain Printer. A standard
character set may have 48, 64, or 96 characters.
Advantages:
Character fonts can easily be changed.
Different languages can be used with the same printer.
Disadvantages:
Noisy