Topic Review
1D MPC and Thin-Film Analysis
The development of magnetic photonic crystals (MPC) has been a rapidly evolving research area since the late 1990s. Magneto-optic (MO) materials and the techniques for their characterization have also continually undergone functional and property-related improvements. MPC Optimization is a feature-rich Windows software application designed to enable researchers to analyse the optical and magneto-optical spectral properties of multilayers containing gyrotropic constituents. A set of computational approaches, and a custom software package have been described, designed to enable the design and optimization of 1D magnetic photonic crystals in terms of the achievable combinations of Faraday rotation, transmission, and reflection spectra. 
  • 981
  • 25 Aug 2021
Topic Review
2 × 2 Real Matrices
In mathematics, the associative algebra of 2×2 real matrices is denoted by M(2, R). Two matrices p and q in M(2, R) have a sum p + q given by matrix addition. The product matrix p q is formed from the dot product of the rows and columns of its factors through matrix multiplication. For let Then q q* = q* q = (ad − bc) I, where I is the 2×2 identity matrix. The real number ad − bc is called the determinant of q. When ad − bc ≠ 0, q is an invertible matrix, and then The collection of all such invertible matrices constitutes the general linear group GL(2, R). In terms of abstract algebra, M(2, R) with the associated addition and multiplication operations forms a ring, and GL(2, R) is its group of units. M(2, R) is also a four-dimensional vector space, so it is considered an associative algebra. The 2×2 real matrices are in one-one correspondence with the linear mappings of the two-dimensional Cartesian coordinate system into itself by the rule The next section displays M(2,R) is a union of planar cross sections that include a real line. M(2,R) is ring isomorphic to split-quaternions, where there is a similar union but with index sets that are hyperboloids.
  • 552
  • 01 Nov 2022
Topic Review
2020 Twitter Bitcoin Scam
User:RMCD bot/subject notice On July 15, 2020, between 20:00 and 22:00 UTC, around 130 high-profile Twitter accounts were compromised by outside parties to promote a bitcoin scam. Twitter and other media sources confirmed that the perpetrators had gained access to Twitter's administrative tools so that they could alter the accounts themselves and post the tweets directly. They appeared to have used social engineering to gain access to the tools via Twitter employees. The scam tweets asked individuals to send bitcoin currency to a specific cryptocurrency wallet, with the promise of the Twitter user that money sent would be doubled and returned as a charitable gesture. Within minutes from the initial tweets, more than 320 transactions had already taken place on one of the wallet addresses, and more than US$110,000 of equivalent bitcoin had been deposited in one account before the scam messages were removed by Twitter. In addition, full message history data from eight non-verified accounts was also acquired. Dmitri Alperovitch, the co-founder of cybersecurity company CrowdStrike, described the incident as "the worst hack of a major social media platform yet." The FBI and other law enforcement agencies are investigating the scam and the security used by Twitter. Security researchers expressed concerns that the social engineering used to execute the hack can affect the use of social media in important online discussions, including the lead-up into the 2020 United States presidential election.
  • 1.9K
  • 17 Nov 2022
Topic Review
2D Filters
Two dimensional filters have seen substantial development effort due to their importance and high applicability across several domains. In the 2-D case the situation is quite different from the 1-D case, because the multi-dimensional polynomials cannot in general be factored. This means that an arbitrary transfer function cannot generally be manipulated into a form required by a particular implementation. The input-output relationship of a 2-D IIR filter obeys a constant-coefficient linear partial difference equation from which the value of an output sample can be computed using the input samples and previously computed output samples. Because the values of the output samples are fed back, the 2-D filter, like its 1-D counterpart, can be unstable.
  • 540
  • 26 Oct 2022
Topic Review
3D Interaction
In computing, 3D interaction is a form of human-machine interaction where users are able to move and perform interaction in 3D space. Both human and machine process information where the physical position of elements in the 3D space is relevant. The 3D space used for interaction can be the real physical space, a virtual space representation simulated in the computer, or a combination of both. When the real space is used for data input, humans perform actions or give commands to the machine using an input device that detects the 3D position of the human action. When it is used for data output, the simulated 3D virtual scene is projected onto the real environment through one output device or a combination of them.
  • 876
  • 29 Nov 2022
Topic Review
3DNow!
3DNow! is a deprecated extension to the x86 instruction set developed by Advanced Micro Devices (AMD). It adds single instruction multiple data (SIMD) instructions to the base x86 instruction set, enabling it to perform vector processing of floating-point vector-operations using Vector registers, which improves the performance of many graphic-intensive applications. The first microprocessor to implement 3DNow was the AMD K6-2, which was introduced in 1998. When the application was appropriate, this raised the speed by about 2–4 times. However, the instruction set never gained much popularity, and AMD announced on August 2010 that support for 3DNow would be dropped in future AMD processors, except for two instructions (the PREFETCH and PREFETCHW instructions). The two instructions are also available in Bay-Trail Intel processors.
  • 607
  • 03 Nov 2022
Topic Review
9Dragons
9Dragons is a martial arts-themed massively multiplayer online role playing game, developed by Korean video game company Indy21. The game features 3D graphics and traditional Massively multiplayer online game control schemes. Set in China during the Ming Dynasty, it includes actual Chinese geography and historical features such as the Great Wall of China and the famous Shaolin Monastery.
  • 669
  • 17 Nov 2022
Topic Review
A Certain Magical Index
A Certain Magical Index (Japanese: とある魔術の禁書目録 (インデックス), Hepburn: Toaru Majutsu no Indekkusu)[lower-alpha 1] is a Japanese light novel series written by Kazuma Kamachi and illustrated by Kiyotaka Haimura, which has been published by ASCII Media Works under their Dengeki Bunko imprint since April 2004. The plot is set in a world where supernatural abilities exist. The light novels focus on Toma Kamijo, a young high school student in Academy City who has an unusual ability, as he encounters an English nun named Index. His ability and relationship with Index proves dangerous to other sorcerers and Espers who want to discover the secrets behind him and Index, as well as the city. Yen Press have licensed the novels in North America. A manga adaptation by Chuya Kogino began serialization in Monthly Shōnen Gangan from May 2007. J.C.Staff produced two 24-episode anime series between 2008 and 2011. An animated film was released in February 2013. The anime adaptations are licensed in North America by Funimation. A 26-episode third season aired between 2018 and 2019, licensed by Funimation. The side-story manga series, A Certain Scientific Railgun, began serialization in Dengeki Daioh in February 2007. A second side-story manga series, A Certain Scientific Accelerator, began serialization in Dengeki Daioh in December 2013.
  • 1.1K
  • 19 Oct 2022
Topic Review
A discrete quantum momentum operator
We introduce finite-differences derivatives intended to be exact when applied to the real exponential function. We want to recover the known results of continuous calculus with our finite differences derivatives but in a discrete form. The purpose of this work is to have a discrete momentum operator suitable for use as an operator in discrete quantum mechanics theory.
  • 1.7K
  • 24 Aug 2021
Topic Review
Accessible Higher-Education: A Framework for Continuous Improvement
The SARS-CoV-2 Coronavirus pandemic (COVID-19) forced educational institutions to move their programs to the virtual world, revealing needs such as the lack of accessibility of online resources and content. In this context, the Erasmus+ project "Technological Assistance to Accessibility in Virtual Higher Education (EduTech)”, proposed tools and knowledge focused on improving accessibility in Higher Education Institutions (HEIs). In this article, a framework that integrates all the findings of the EduTech project is presented. The proposed framework is aimed at facilitating the adoption of good practices related to technological accessibility in HEI. The framework considers the limitations and needs of the institutions in terms of governance and resources for improving accessibility. The framework was adopted by four Latin American HEIs to establish a continuous improvement strategy according to their needs and current level of accessibility focus. This research also shows the results and suggests that the proposal is adaptable to the needs of HEIs, allowing its implementation regardless of their organizational structure and their current level of attention to accessibility.
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  • 16 Oct 2023
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