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HandWiki is the world's largest wiki-style encyclopedia dedicated to science, technology and computing. It allows you to create and edit articles as long as you have external citations and login account. In addition, this is a content management environment that can be used for collaborative editing of original scholarly content, such as books, manuals, monographs and tutorials.

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Video Super Resolution
Video Super Resolution is the process of generating high-resolution video frames from the given low-resolution ones. The main goal is to restore more fine details, while saving coarse ones. There are many approaches for this task, but it's still popular and challenging problem.
  • 1.8K
  • 17 Nov 2022
Topic Review
Options Strategy
Option strategies are the simultaneous, and often mixed, buying or selling of one or more options that differ in one or more of the options' variables. Call options, simply known as calls, give the buyer a right to buy a particular stock at that option's strike price. Conversely, put options, simply known as puts, give the buyer the right to sell a particular stock at the option's strike price. This is often done to gain exposure to a specific type of opportunity or risk while eliminating other risks as part of a trading strategy. A very straightforward strategy might simply be the buying or selling of a single option, however option strategies often refer to a combination of simultaneous buying and or selling of options. Options strategies allow traders to profit from movements in the underlying assets based on market sentiment (i.e., bullish, bearish or neutral). In the case of neutral strategies, they can be further classified into those that are bullish on volatility, measured by the lowercase Greek letter sigma (σ), and those that are bearish on volatility. Traders can also profit off time decay, measured by the uppercase Greek letter theta (Θ), when the stock market has low volatility. The option positions used can be long and/or short positions in calls and puts.
  • 2.1K
  • 17 Nov 2022
Topic Review
Regenerative Brake
Regenerative braking is an energy recovery mechanism that slows down a moving vehicle or object by converting its kinetic energy into a form that can be either used immediately or stored until needed. In this mechanism, the electric traction motor uses the vehicle's momentum to recover energy that would otherwise be lost to the brake discs as heat. This contrasts with conventional braking systems, where the excess kinetic energy is converted to unwanted and wasted heat due to friction in the brakes, or with rheostatic brakes, where the energy is recovered by using electric motors as generators but is immediately dissipated as heat in resistors. In addition to improving the overall efficiency of the vehicle, regeneration can significantly extend the life of the braking system as the mechanical parts will not wear out very quickly.
  • 2.4K
  • 17 Nov 2022
Topic Review
Climate Change and Invasive Species
Human-caused climate change and the rise in invasive species are directly linked through changing of ecosystems. This relationship is notable because climate change and invasive species are also considered by the USDA to be two of the top four causes of global biodiversity loss.
  • 1.2K
  • 17 Nov 2022
Topic Review
Enchroma
EnChroma lenses are glasses designed to improve and modify some aspects of color vision deficiency for color blind people. The glasses were invented by Dr. Donald McPherson in 2002. Wearing the glasses results in subtle differences when color blind people look longer and more carefully.
  • 1.5K
  • 17 Nov 2022
Topic Review
All-points Bulletin
An all-points bulletin (APB) is an electronic information broadcast sent from one sender to a group of recipients, to rapidly communicate an important message. The technology used to send this broadcast has varied throughout time, and includes Teletype, Radio, Computerised Bulletin Board Systems (CBBS), and Internet. The earliest known record of the all-points bulletin is when used by American police, which dates the term to 1947. Although, used in the field of policing at the time, the APB has had usage in fields such as politics, technology and science research. However, since the 21st Century, due to advances in technology, all-points bulletins have become significantly less common and are now only primarily used by police departments in countries such as America, Canada, Australia and the United Kingdom.
  • 2.3K
  • 17 Nov 2022
Topic Review
Samsung Knox
Samsung Knox is a proprietary security and management framework pre-installed on most Samsung mobile devices. Its primary purpose is to provide organizations with a toolset for managing work devices, such as employee mobile phones or interactive kiosks. Knox provides more granular control over the standard work profile to manage capabilities found only on Samsung devices. Knox's features fall within three categories: data security, device manageability, and VPN capability. Knox also provides web-based services for organizations to manage their devices. Organizations can customize their managed mobile devices by configuring various functions, including pre-loaded applications, settings, boot-up animations, home screens, and lock screens. As of December 2020, organizations can use specific Samsung mobile device cameras as barcode scanners, using Knox services to capture and analyze the data.
  • 3.2K
  • 17 Nov 2022
Topic Review
Love Letter
A love letter is a romantic way to express feelings of love in written form. Whether delivered by hand, mail, carrier pigeon, or romantically left in a secret location, the letter may be anything from a short and simple message of love to a lengthy explanation of feelings. Love letters may 'move through the widest range of emotions – devotion, disappointment, grief and indignation, self-confidence, ambition, impatience, self-reproach and resignation'.
  • 2.6K
  • 17 Nov 2022
Topic Review
Sexological Testing
Sexuality can be inscribed in a multidimensional model comprising different aspects of human life: biology, reproduction, culture, entertainment, relationships and love. In the last decades, a growing interest towards sexuality and a greater quest to acknowledge a "right to sexuality" has occurred both in society and individuals. The consequence of this evolution has been a renewed and more explicit call for intervention from those who suffer, or think they suffer from alterations of their sexual and relational sphere. This has produced an increased attention of medicine and psychology towards sexual dysfunctions and the problems they cause in individuals and couples. Science has gradually adjusted already existing research tools, mostly used in other fields of clinical research, to the field of sexology, so completing and increasing the number of tools in the "toolkit" of various branches of sexological diagnosis. Psychological measurements cannot be considered as accurate as physical ones (weight, height, mass, etc.), as the former evaluate those aspects and variables pertaining to an "individual" whose individuality refers to his/her own psychological, personological and environmental constituents: emotions, expressiveness, senses, feelings and experiences which can greatly vary according to the subjects and change in the short period or depending on different settings, even in the same individual. What is expected of psychological measurements is "sufficient" accuracy and reliability, i.e. capability to express an indication or focus which clinicians can use as a "guideline" to rapidly and accurately deepen the aspects highlighted by the measurements and check them together with their patients. For this purpose, several statistical validation indexes of psychodiagnostic tests are provided: from standardization to various constructions of validity (internal, external, face, construct, convergent, content, discriminant, etc.). There are several sexual dysfunctions and each of them has a different cause. Therefore, the field of sexology provides different psychological evaluation devices in order to examine the various aspects of the discomfort, problem or dysfunction, regardless of whether they are individual or relational ones. The number of psychodiagnostic reactives is certainly wide and heterogeneous, nevertheless, the number of tests specifically meant for the field of sexology is quite limited. The following list (in alphabetical order) is not exhaustive but shows the best known and/or most used reactives in the field of sexological and relational psychodiagnosis.
  • 1.5K
  • 17 Nov 2022
Topic Review
Friction Force Microscope
In materials science, chemical force microscopy (CFM) is a variation of atomic force microscopy (AFM) which has become a versatile tool for characterization of materials surfaces. With AFM, structural morphology is probed using simple tapping or contact modes that utilize van der Waals interactions between tip and sample to maintain a constant probe deflection amplitude (constant force mode) or maintain height while measuring tip deflection (constant height mode). CFM, on the other hand, uses chemical interactions between functionalized probe tip and sample. Choice chemistry is typically gold-coated tip and surface with R–SH thiols attached, R being the functional groups of interest. CFM enables the ability to determine the chemical nature of surfaces, irrespective of their specific morphology, and facilitates studies of basic chemical bonding enthalpy and surface energy. Typically, CFM is limited by thermal vibrations within the cantilever holding the probe. This limits force measurement resolution to ~1 pN which is still very suitable considering weak COOH/CH3 interactions are ~20 pN per pair. Hydrophobicity is used as the primary example throughout this consideration of CFM, but certainly any type of bonding can be probed with this method.
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  • 17 Nov 2022
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