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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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Electron Rest Mass
The electron rest mass (symbol: me) is the mass of a stationary electron, also known as the invariant mass of the electron. It is one of the fundamental constants of physics. It has a value of about 9.109×10−31 kilograms or about 5.486×10−4 daltons, equivalent to an energy of about 8.187×10−14 joules or about 0.5110 MeV.
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  • 31 Oct 2022
Topic Review
Online Hate Speech
Online hate speech is a type of speech that takes place online with the purpose of attacking a person or a group based on their race, religion, ethnic origin, sexual orientation, disability, or gender. Online hate speech is the expression of conflicts between different groups within and across societies. Online hate speech is a vivid example of how the Internet brings both opportunities and challenges regarding the freedom of expression and speech while also defending human dignity. Multilateral treaties such as the International Covenant on Civil and Political Rights (ICCPR) have sought to define its contours. Multi-stakeholders processes (e.g. the Rabat Plan of Action) have tried to bring greater clarity and suggested mechanisms to identify hateful messages. Yet, hate speech is still a generic term in everyday discourse, mixing concrete threats to individuals and/or groups with cases in which people may be simply venting their anger against authority. Internet intermediaries—organizations that mediate online communication such as Facebook, Twitter, and Google—have advanced their own definitions of hate speech that bind users to a set of rules and allow companies to limit certain forms of expression. National and regional bodies have sought to promote understandings of the term that are more rooted in local traditions. The Internet's speed and reach makes it difficult for governments to enforce national legislation in the virtual world. Social media is a private space for public expression, which makes it difficult for regulators. Some of the companies owning these spaces have become more responsive towards tackling the problem of hate speech online. Politicians, activists, and academics discuss the character of online hate speech and its relation to offline speech and action, but the debates tend to be removed from systematic empirical evidence. The character of perceived hate speech and its possible consequences has led to placing much emphasis on the solutions to the problem and on how they should be grounded in international human rights norms. Yet this very focus has also limited deeper attempts to understand the causes underlying the phenomenon and the dynamics through which certain types of content emerge, diffuse and lead—or not—to actual discrimination, hostility or violence. Online hate speech has been on the rise since the start of 2020, with COVID-19 tensions, Anti-Asian rhetoric, ongoing racial injustice, mass civil unrest, violence, and the 2020 Presidential Election. Yet, many instances of hate speech have been refuted with the First Amendment, which allows online hate speech to continue.
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  • 31 Oct 2022
Topic Review
Proposed Melbourne Rail Extensions
Several proposals have been put forward by various groups to expand the Melbourne rail network—proposals for additional rail lines, extensions to existing lines, as well as electrification to existing lines and new stations on existing lines. Some of these plans were so seriously considered at various times that they appeared in the Melway street directory, and on suburban train destination rolls.
  • 2.9K
  • 31 Oct 2022
Topic Review
Microsoft DoubleGuard
DriveSpace (initially known as DoubleSpace) is a disk compression utility supplied with MS-DOS starting from version 6.0 in 1993 and ending in 2000 with the release of Windows Me. The purpose of DriveSpace is to increase the amount of data the user could store on disks by transparently compressing and decompressing data on-the-fly. It is primarily intended for use with hard drives, but use for floppy disks is also supported. This feature was removed in Windows XP and later.
  • 509
  • 31 Oct 2022
Topic Review
Diversity (Business)
The business case for diversity stems from the progression of the models of diversity within the workplace since the 1960s. In the United States, the original model for diversity was situated around affirmative action drawing from equal opportunity employment objectives implemented in the Civil Rights Act of 1964. Equal employment opportunity was centered around the idea that any individual academically or physically qualified for a specific job could strive for (and possibly succeed) at obtaining the said job without being discriminated against based on identity. This compliance-based model gave rise to the idea that tokenism was the reason an individual was hired into a company when they differed from the dominant group. Dissatisfaction from minority groups eventually altered and/or raised the desire to achieve perfect employment opportunities in every job. The social justice model evolved next and extended the idea that individuals outside the dominant group should be given opportunities within the workplace, not only because it was instituted as a law, but because it was the right thing to do. Kevin Sullivan an ex-vice president of Apple Inc. said that "diversity initiatives must be sold as business, not social work." This model still revolved around the idea of tokenism, but it also brought in the notion of hiring based on a "good fit".In the deficit model, it is believed that organizations that do not have a strong diversity inclusion culture will invite lower productivity, higher absenteeism, and higher turnover which will result in higher costs to the company. Establishments with more diversity are less likely to have successful unionization attempts.
  • 1.8K
  • 02 Nov 2022
Topic Review
Dosage Compensation
Dosage compensation is the process by which organisms equalize the expression of genes between members of different biological sexes. Across species, different sexes are often characterized by different types and numbers of sex chromosomes. In order to neutralize the large difference in gene dosage produced by differing numbers of sex chromosomes among the sexes, various evolutionary branches have acquired various methods to equalize gene expression among the sexes. Because sex chromosomes contain different numbers of genes, different species of organisms have developed different mechanisms to cope with this inequality. Replicating the actual gene is impossible; thus organisms instead equalize the expression from each gene. For example, in humans, females (XX) silence the transcription of one X chromosome of each pair, and transcribe all information from the other, expressed X chromosome. Thus, human females have the same number of expressed X-linked genes as do human males (XY), both sexes having essentially one X chromosome per cell, from which to transcribe and express genes. There are three main mechanisms of achieving dosage compensation which are widely documented in the literature and which are common to most species. These include random inactivation of one female X chromosome (as observed in Mus musculus; this is called X-inactivation), a two-fold increase in the transcription of a single male X chromosome (as observed in Drosophila melanogaster), and decreased transcription by half in both of the X chromosomes of a hermaphroditic organism (as observed in Caenorhabditis elegans). These mechanisms have been widely studied and manipulated in model organisms commonly used in the laboratory research setting. A summary of these forms of dosage compensation is illustrated below. However, there are also other less common forms of dosage compensation, which are not as widely researched and are sometimes specific to only one species (as observed in certain bird and monotreme species).
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  • 31 Oct 2022
Topic Review
Environmental Impact of Shipping
The environmental impact of shipping includes air pollution, water pollution, acoustic, and oil pollution. Ships are responsible for more than 18 percent of some air pollutants. It also includes greenhouse gas emissions. The International Maritime Organization (IMO) estimates that carbon dioxide emissions from shipping were equal to 2.2% of the global human-made emissions in 2012 and expects them to rise 50 to 250 percent by 2050 if no action is taken. There is a perception that cargo transport by ship is low in air pollutants, because for equal weight and distance it is the most efficient transport method, according to shipping researcher Alice Bows-Larkin. This is particularly true in comparison to air freight. However, because sea shipment accounts for far more annual tonnage and the distances are often large, shipping's emissions are globally substantial. A difficulty is that the annual increasing amount of shipping overwhelms gains in efficiency, such as from slow-steaming or the use of kites. The growth in tonne-kilometers of sea shipment has averaged 4 percent yearly since the 1990s, and it has grown by a factor of 5 since the 1970s. There are now over 100,000 transport ships at sea, of which about 6,000 are large container ships. The fact that shipping enjoys substantial tax privileges has contributed to the growing emissions.
  • 29.8K
  • 31 Oct 2022
Topic Review
Amalgam
An amalgam is an alloy of mercury with another metal. It may be a liquid, a soft paste or a solid, depending upon the proportion of mercury. These alloys are formed through metallic bonding, with the electrostatic attractive force of the conduction electrons working to bind all the positively charged metal ions together into a crystal lattice structure. Almost all metals can form amalgams with mercury, the notable exceptions being iron, platinum, tungsten, and tantalum. Silver-mercury amalgams are important in dentistry, and gold-mercury amalgam is used in the extraction of gold from ore. Dentistry has used alloys of mercury with metals such as silver, copper, indium, tin and zinc.
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  • 31 Oct 2022
Topic Review
Ural–Altaic Languages
Ural–Altaic, Uralo-Altaic or Uraltaic is a linguistic convergence zone and former language-family proposal uniting the Uralic and the Altaic (in the narrow sense) languages. It is generally now agreed that even the Altaic languages most likely do not share a common descent: the similarities among Turkic, Mongolic and Tungusic are better explained by diffusion and borrowing. The term continues to be used for the central Eurasian typological, grammatical and lexical convergence zone. Indeed, "Ural-Altaic" may be preferable to "Altaic" in this sense. For example, J. Janhunen states that "speaking of 'Altaic' instead of 'Ural-Altaic' is a misconception, for there are no areal or typological features that are specific to 'Altaic' without Uralic." Originally suggested in the 18th century, the genealogical and racial hypotheses remained debated into the mid-20th century, often with disagreements exacerbated by pan-nationalist agendas. It had many proponents in Britain. Since the 1960s, the proposed language family has been widely rejected. A relationship between the Altaic, Indo-European and Uralic families was revived in the context of the Nostratic hypothesis, which was popular for a time, with for example Allan Bomhard treating Uralic, Altaic and Indo-European as coordinate branches. However, Nostratic too is now mostly rejected.
  • 4.9K
  • 31 Oct 2022
Topic Review
Homoscedasticity
In statistics, a sequence (or a vector) of random variables is homoscedastic/ˌhoʊmoʊskəˈdæstɪk/ if all its random variables have the same finite variance. This is also known as homogeneity of variance. The complementary notion is called heteroscedasticity. The spellings homoskedasticity and heteroskedasticity are also frequently used. Assuming a variable is homoscedastic when in reality it is heteroscedastic (/ˌhɛtəroʊskəˈdæstɪk/) results in unbiased but inefficient point estimates and in biased estimates of standard errors, and may result in overestimating the goodness of fit as measured by the Pearson coefficient.
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  • 31 Oct 2022
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