RFID
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RFID technology uses radio waves to transmit data between a reader and an RFID tag for identification and tracking purposes. RFID has applications in supply chain management, access control, livestock tracking, toll collection and other areas due to benefits like non-contact tracking and large data storage. However, RFID also has drawbacks like higher costs compared to barcode and a limited effective range for reading tags.
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Demystifying Rfid
This document provides an overview of radio frequency identification (RFID) technology. It discusses RFID's origins in radio and radar technology from the early 20th century. It describes the four main components of an RFID system: the host computer, reader, antenna, and transponder or tag. The document also summarizes different types of tags and frequencies used, current applications of RFID in retail supply chains and toll collection, and future potential applications involving human implantation. It concludes by identifying key challenges to broader RFID adoption as reducing tag costs and addressing privacy concerns.
RFID Whitepaper for Steel Industry
This document provides an overview of radio frequency identification (RFID) technology, including its history, components, frequency ranges used, standards and adoption challenges. Key points include:
1) RFID uses radio waves to automatically identify objects using tags attached to or embedded in them. Major retailers like Walmart now require RFID tagging of pallets and cases.
2) An RFID system consists of a microchip tag and antenna that can be read by a scanner. Tags can be passive (drawing power from the reader) or active (with an internal power source).
3) Different frequency ranges including low, high and ultra-high are used depending on read range and material penetration needs. Standardization has helped
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In this paper, we discuss different designs of microstrip patch antennas for UHF RFID Tag applications mounted on metallic surface. We discuss the various requirements of such designs like size, bandwidth, circular polarization. Out of UHF band 860MHz to 960MHz is assigned for RFID applications.
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This document appears to contain a street name or address with the letters "R", "I", "V", "E", "R", "R", "D", and "." on separate lines. It does not contain enough context or details to provide a more informative summary.
C72 Mobile Computer
Chainway is a leading provider of RFID and barcode technology products and solutions in China. They produce the C72, an Android rugged mobile computer for enterprise use. The C72 features a quad-core processor, 8,000mAh battery, 4G LTE connectivity, WiFi and Bluetooth, and superior UHF RFID and barcode scanning capabilities for asset management, retail, warehousing and other applications. It is durable with an IP65 rating and can withstand multiple drops to concrete.
أحدث 10 تقنيات فى مجال المكتبات
This document lists and briefly describes 9 different technologies: 1) iBeacon uses Bluetooth to provide location-based services, 2) RFID uses radio frequency identification to track objects, 3) QR codes use barcodes to provide additional information, 4) OCR uses optical character recognition to read text from images, 5) 3D printing creates physical objects from digital files, 6) GPS uses satellites to pinpoint geographic location outdoors, 7) robotics research aims to create machines that can assist humans, 8) global positioning system is another term for GPS technology, 9) assistant refers to artificial intelligence systems designed to help people.
Online i os
iOS is Apple's mobile operating system, second only to Android in market share. Key iOS applications include FaceTime for video calls between Apple devices, AirPlay for streaming media, Find My iPhone for device tracking, and iCloud for data backup. The App Store allows downloading third-party apps, and iOS is developed using Apple programming languages like Objective-C and Swift. Major iOS versions have introduced features such as the App Store, push notifications, multitasking, and Siri voice assistant.
Linux and windows
Windows is a popular operating system created by Microsoft that runs on most computers. It has gone through several versions since Windows 1.0, with each new version adding features like support for more colors, multimedia functionality, plug-and-play hardware installation, internet connectivity, firewall protection, and updated user interfaces. Open source operating systems are also discussed, including examples like Linux, advantages like security and cost effectiveness, and some disadvantages like needing commands instead of graphical interfaces for certain tasks. The document concludes with sections about file systems, attributes, operations, and different file system types like FAT, NTFS, Ext, and Samba.
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Demystifying Rfid
This document provides an overview of radio frequency identification (RFID) technology. It discusses RFID's origins in radio and radar technology from the early 20th century. It describes the four main components of an RFID system: the host computer, reader, antenna, and transponder or tag. The document also summarizes different types of tags and frequencies used, current applications of RFID in retail supply chains and toll collection, and future potential applications involving human implantation. It concludes by identifying key challenges to broader RFID adoption as reducing tag costs and addressing privacy concerns.
RFID Whitepaper for Steel Industry
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1) RFID uses radio waves to automatically identify objects using tags attached to or embedded in them. Major retailers like Walmart now require RFID tagging of pallets and cases.
2) An RFID system consists of a microchip tag and antenna that can be read by a scanner. Tags can be passive (drawing power from the reader) or active (with an internal power source).
3) Different frequency ranges including low, high and ultra-high are used depending on read range and material penetration needs. Standardization has helped
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In this paper, we discuss different designs of microstrip patch antennas for UHF RFID Tag applications mounted on metallic surface. We discuss the various requirements of such designs like size, bandwidth, circular polarization. Out of UHF band 860MHz to 960MHz is assigned for RFID applications.
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أحدث 10 تقنيات فى مجال المكتبات
This document lists and briefly describes 9 different technologies: 1) iBeacon uses Bluetooth to provide location-based services, 2) RFID uses radio frequency identification to track objects, 3) QR codes use barcodes to provide additional information, 4) OCR uses optical character recognition to read text from images, 5) 3D printing creates physical objects from digital files, 6) GPS uses satellites to pinpoint geographic location outdoors, 7) robotics research aims to create machines that can assist humans, 8) global positioning system is another term for GPS technology, 9) assistant refers to artificial intelligence systems designed to help people.
Online i os
iOS is Apple's mobile operating system, second only to Android in market share. Key iOS applications include FaceTime for video calls between Apple devices, AirPlay for streaming media, Find My iPhone for device tracking, and iCloud for data backup. The App Store allows downloading third-party apps, and iOS is developed using Apple programming languages like Objective-C and Swift. Major iOS versions have introduced features such as the App Store, push notifications, multitasking, and Siri voice assistant.
Linux and windows
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- It describes some key Android versions from 2008-2017 including features added in each version.
- It also covers Android software stack components like applications, application framework, libraries and the Linux kernel.
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Turtle Graphics in CG
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Visible surface detection methods
There are two main categories of visible surface detection algorithms: object-space methods that compare objects in a 3D scene, and image-space methods that determine visibility on a per-pixel basis. The painter's algorithm sorts polygons by depth and draws more distant polygons before closer ones, covering some areas. The binary space partitioning algorithm draws polygons farther from the viewpoint before closer ones. Back face detection identifies whether a surface's normal vector points towards or away from the viewpoint.
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Ink jet printer
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Illumination models
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Dot matrix printers
Dot matrix printers print characters by punching dots in a pattern onto paper like a typewriter. Each character is made up of a specific dot pattern, with letters like H having 7 dots in the first column, 2 in the fourth column, and 7 in the last column. While dot matrix printers are the cheapest per page for printing, they have cons of only printing one character at a time, very low resolution, and poor printing speed.
Cathode ray tubes
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Digital libraries
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Ethernet
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Wi – fi ( 802.11)
Wi-Fi allows devices to connect to the internet wirelessly using radio waves. It provides data transfer rates up to 600 Mbps within a coverage distance of about 100 meters. Multiple devices can connect to a Wi-Fi network through a router, unlike Bluetooth which only supports 7 devices. Wi-Fi networks use SSIDs to identify the network and access points to connect wireless devices to wired networks. Common standards include 802.11a, b, g, and n which provide higher data rates and backward compatibility. Security measures for Wi-Fi include MAC address filtering and WEP encryption.
Bluetooth
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- Bluetooth versions have increased data transfer speeds over time, from 721 kbps in version 1.1 to 24 mbps in version 3.0.
- It uses less power than infrared (IR) technology and has no line-of-sight requirements between devices.
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- It describes some key Android versions from 2008-2017 including features added in each version.
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This document discusses email security and related topics. It covers firewalls, what can be done with firewalls like web filtering and bandwidth filtering. It also discusses screenshots of a college firewall. Other topics include access control lists, TCP connection establishment and termination, DNS, ICMP, common error messages, port numbers, email structure, SMTP, MIME, POP, IMAP, and TLS.
Visible surface detection methods
There are two main categories of visible surface detection algorithms: object-space methods that compare objects in a 3D scene, and image-space methods that determine visibility on a per-pixel basis. The painter's algorithm sorts polygons by depth and draws more distant polygons before closer ones, covering some areas. The binary space partitioning algorithm draws polygons farther from the viewpoint before closer ones. Back face detection identifies whether a surface's normal vector points towards or away from the viewpoint.
Raster scan and random scan
This document discusses raster and random scan display technologies. It defines key concepts like pixels, aspect ratio, and frame buffers. Pixels make up raster images and are arranged in a grid, with more pixels providing higher resolution. A frame buffer is RAM that stores a bitmap driving a video display. Raster scan uses pixels along scan lines and has lower resolution but is less expensive than random scan, which uses mathematical equations to describe images and provides smoother lines but is more costly.
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This document discusses various properties and behaviors of light, including reflection, refraction, diffraction, and how light interacts with materials and objects. It notes that light travels in straight lines, is faster than sound, allows us to see by reflecting into our eyes, and causes shadows when blocked by objects. The document also addresses how light can be absorbed or reflected by objects and that the color of an object is determined by the dominant frequency of the light.
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A polygon mesh is a collection of vertices, edges, and faces that defines the shape of a 3D polyhedral object. It is constructed by joining polygons together at common edges. Popular methods for constructing meshes include box modeling techniques like subdividing and extruding existing geometry. Extruding a face creates a new connected face of the same shape. Mesh representations include vertex-vertex meshes defined by connected vertices, face-vertex meshes defined by faces and vertices, and dynamic meshes that explicitly store face-vertex and vertex-face relationships. Polygon meshes are represented using tables that store vertex coordinates, edge connections, and surface definitions.
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Inkjet printers work by using electrostatic charges to propel droplets of ink onto paper to create a digital image. The main components of an inkjet printer include the print head which contains nozzles that spray ink, a stepper motor that moves the print head, ink cartridges that hold different color inks, a belt that attaches the print head to the motor, and rollers and circuitry that control paper movement and the printing process. Pros of inkjet printers are their low cost, high quality color output, ease of use, and quiet operation while cons include less durable print heads, expensive ink cartridges, slower speeds than laser printers, and sensitivity of ink to water.
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The document discusses various illumination models used in computer graphics including ambient light, point light sources, distributed light sources, Beer Lambert's law, chromaticity diagrams, flat shading, Gouraud shading, the Phong illumination model, and the Ward illumination model. It provides details on how each model calculates light intensity and color values for surfaces and polygons in a 3D scene.
Dot matrix printers
Dot matrix printers print characters by punching dots in a pattern onto paper like a typewriter. Each character is made up of a specific dot pattern, with letters like H having 7 dots in the first column, 2 in the fourth column, and 7 in the last column. While dot matrix printers are the cheapest per page for printing, they have cons of only printing one character at a time, very low resolution, and poor printing speed.
Cathode ray tubes
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NFC requires less power than Bluetooth but has a much shorter range. It transmits data at lower speeds than Bluetooth but can establish connections faster by using inductive coupling without manual pairing. NFC is used for quickly transferring small amounts of data like photos or files between devices by tapping them together, as well as for mobile payments if both the device and vendor support NFC transactions.
Digital libraries
Digital libraries provide reference lists, citations, and metrics for evaluating impact and influence. A reference list contains sources used for research organized by type like books, journals, papers and theses. Citations occur within the text and identify author and source for direct quotes and paraphrases. They provide additional publication information. Citation networks, documents with high impacts, or similar patterns can be identified. The i10-Index represents the number of publications with 10 or more citations. Charles Darwin's i10-Index is provided as an example. The H-Index reflects the number of papers cited at least as many times as the index number, measuring both quantity and impact with a single value.
Covert networks
Covert networks are hidden networks whose users do not disclose their information externally. They use covert channels that are hidden from access controls and security mechanisms, allowing communication to bypass detection. Covert networks employ techniques like steganography to conceal files within other files or messages, and use blind carbon copy to send messages privately to large groups without revealing all email addresses.
Ethernet
Ethernet is a popular wired network cable that was introduced in 1980 to connect devices like PCs and switches. It uses physical addresses called MAC addresses to identify devices on the network. Ethernet addresses are 6 bytes long and can be unicast for point-to-point connections or multicast for one-to-many connections. Common types of Ethernet cables include 10BaseT, 100BaseTX, and 1000BaseT which support speeds of 10 Mbps, 100 Mbps, and 1 Gbps respectively over twisted pair copper cables. Faster versions like 10BaseF and 100BaseFX use fiber optic cables.
Wi – fi ( 802.11)
Wi-Fi allows devices to connect to the internet wirelessly using radio waves. It provides data transfer rates up to 600 Mbps within a coverage distance of about 100 meters. Multiple devices can connect to a Wi-Fi network through a router, unlike Bluetooth which only supports 7 devices. Wi-Fi networks use SSIDs to identify the network and access points to connect wireless devices to wired networks. Common standards include 802.11a, b, g, and n which provide higher data rates and backward compatibility. Security measures for Wi-Fi include MAC address filtering and WEP encryption.
Bluetooth
Bluetooth is a wireless technology that allows electronic devices to communicate without wires. It uses radio waves to transmit data within a short range of up to 10 meters. Some key aspects of Bluetooth include:
- It operates using a master-slave architecture called a piconet, where one device acts as the master and can communicate with up to 7 slave devices. Multiple piconets can be connected to form a scatternet.
- Bluetooth versions have increased data transfer speeds over time, from 721 kbps in version 1.1 to 24 mbps in version 3.0.
- It uses less power than infrared (IR) technology and has no line-of-sight requirements between devices.
Switching in Networks
This document discusses different network connection topologies and switching techniques. It begins by explaining that as more nodes need to be connected, switching becomes necessary over point-to-point or bus topologies. Switching allows thousands of nodes to connect by channeling data packets from input ports to their intended destinations. The two main types of switching are circuit switching, which establishes a dedicated physical connection between endpoints, and packet switching, which routes packets independently based on their addresses. Packet switching is better suited for large networks like the internet as it can dynamically route high volumes of traffic without manual intervention if links fail.
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2:同时对留学生所学专业登记给予评定
3:国家专业人才认证中心颁发入库证书
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