Summary

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.

Expand All
Entries
Topic Review
List of Current Monarchies
This is a list of current monarchies. (As of 2019), there are 44 sovereign states in the world with a monarch as Head of state. 13 in Asia, 12 in Europe, 10 in North America, 6 in Oceania and 3 in Africa.
  • 34.3K
  • 28 Oct 2022
Topic Review
Hurricane Preparedness
Cyclone mitigation encompasses the actions and planning taken before a tropical cyclone strikes to mitigate damage and injury from the storm. Knowledge of tropical cyclone impacts on an area help plan for future possibilities. Preparedness may involve preparations made by individuals as well as centralized efforts by governments or other organizations. Tracking storms during the tropical cyclone season helps individuals know current threats. Regional Specialized Meteorological Centers and Tropical Cyclone Warning Centers provide current information and forecasts to help individuals make the best decision possible.
  • 852
  • 28 Oct 2022
Topic Review
British Computer Society
BCS, The Chartered Institute for IT, formerly known as the British Computer Society until 2009, is a professional body and a learned society that represents those working in information technology (IT) and computer science, both in the United Kingdom and internationally. Founded in 1956, BCS has played an important role in educating and nurturing IT professionals, computer scientists, computer engineers, upholding the profession, accrediting chartered IT professional status, and creating a global community active in promoting and furthering the field and practice of computing.
  • 3.0K
  • 28 Oct 2022
Topic Review
Zodiac
The zodiac is a belt-shaped region of the sky that extends approximately 8° north or south (as measured in celestial latitude) of the ecliptic, the apparent path of the Sun across the celestial sphere over the course of the year. The paths of the Moon and visible planets are within the belt of the zodiac. In Western astrology, and formerly astronomy, the zodiac is divided into twelve signs, each occupying 30° of celestial longitude and roughly corresponding to the following star constellations: Aries, Taurus, Gemini, Cancer, Leo, Virgo, Libra, Scorpio, Sagittarius, Capricorn, Aquarius, and Pisces. These astrological signs form a celestial coordinate system, or more specifically an ecliptic coordinate system, which takes the ecliptic as the origin of latitude and the Sun's position at vernal equinox as the origin of longitude.
  • 18.2K
  • 31 Oct 2022
Topic Review
Cubic Mile of Oil
The cubic mile of oil (CMO) is a unit of energy, aiming to give the general public an understanding of large quantities of energy. It is approximately equal to 1.6×1020 joule. It was created by Hew Crane of SRI International to aid in public understanding of global-scale energy consumption and resources. Large scale sources of energy include wind, solar photovoltaic, solar thermal, nuclear, hydroelectric, oil, coal, natural gas, geothermal, and biomass (primarily the burning of wood). Traditionally, many different units are commonly used to measure these sources (e.g., joules, BTUs, kilowatt hours, therms) but only some of them are familiar to a global general public, and some argue that fewer are needed and a standard should be chosen. Still, these common energy units are mainly sized for everyday activities, for example a joule is the energy required to lift a small apple one metre vertically. For regional, national, and global scales, larger energy units, such as exajoule, terawatt-hour, billion barrels of oil equivalent (BBOE) and quad are used. Derived by multiplying the small common units by large powers of ten these larger units pose additional conceptual difficulties for many citizens. Crane intended the cubic mile of oil to provide a visualizable scale for comparing the contributions of these diverse energy components as a percentage of total worldwide, energy use. In 2005, the global economy was consuming approximately 30 billion barrels (4.8 billion cubic metres; 1.3 trillion US gallons) of oil each year. Numbers of this magnitude are difficult to conceive by most people. The volume occupied by 1 trillion US gallons (3.8 billion cubic metres) is about 1 cubic mile (4.2 billion cubic metres). Crane felt that a cubic mile would be an easier concept for the general public than a trillion gallons.
  • 2.3K
  • 28 Oct 2022
Topic Review
Jigsaw (Teaching Technique)
The jigsaw technique is a method of organizing classroom activity that makes students dependent on each other to succeed. It breaks classes into groups and breaks assignments into pieces that the group assembles to complete the (jigsaw) puzzle. It was designed by social psychologist Elliot Aronson to help weaken racial cliques in forcibly integrated schools. The Jigsaw method is beneficial for students learning. The technique splits classes into mixed groups to work on small problems that the group collates into a final outcome. For example, an in-class assignment is divided into topics. Students are then split into groups with one member assigned to each topic. Working individually, each student learns about his or her topic and presents it to their group. Next, students gather into groups divided by topic. Each member presents again to the topic group. In same-topic groups, students reconcile points of view and synthesize information. They create a final report. Finally, the original groups reconvene and listen to presentations from each member. The final presentations provide all group members with an understanding of their own material, as well as the findings that have emerged from topic-specific group discussion. It is a cooperative learning method that brings about both individual accountability and achievement of the team goals. This processes derive its name from the jigsaw puzzle as this process involves in putting the parts of the assignment together to form a whole picture of the assignment which is similar to the jigsaw puzzle. The assignment is divided into parts and the class is also divided into the same number of groups as that of the assignment. Each of these group is given a different topic and allowed to learn about it. These groups are shuffled to form new groups consisting of members from each group.
  • 1.5K
  • 28 Oct 2022
Topic Review
Refractive Index and Extinction Coefficient of Thin-Film Materials
The derivation of the Forouhi–Bloomer dispersion equations is based on obtaining an expression for k as a function of photon energy, symbolically written as k(E), starting from first principles quantum mechanics and solid state physics. An expression for n as a function of photon energy, symbolically written as n(E), is then determined from the expression for k(E) in accordance to the Kramers–Kronig relations which states that n(E) is the Hilbert Transform of k(E). The Forouhi–Bloomer dispersion equations for n(E) and k(E) of amorphous materials are given as: [math]\displaystyle{ k(E) = \frac{A(E-E_g)^2}{E^2-BE+C} \ }[/math] [math]\displaystyle{ n(E) = n(\infty)+\frac{(B_0 E + C_0 )}{E^2-BE+C} \ }[/math] The five parameters A, B, C, Eg, and n(∞) each have physical significance. Eg is the optical energy band gap of the material. A, B, and C depend on the band structure of the material. They are positive constants such that 4C-B2 > 0. Finally, n(∞), a constant greater than unity, represents the value of n at E = ∞. The parameters B0 and C0 in the equation for n(E) are not independent parameters, but depend on A, B, C, and Eg. They are given by: [math]\displaystyle{ B_0 = \frac{A}{Q} \ \left (\frac{-B^2}{2} \ + E_gB - {E_g}^2 + C \right) }[/math] [math]\displaystyle{ C_0 = \frac{A}{Q} \ \left [({E_g}^2 + C) \frac{B}{2} \ - 2E_g C \right] }[/math] where [math]\displaystyle{ Q = \frac{1}{2} \ (4C - B^2 )^{\frac{1}{2}} }[/math] Thus, for amorphous materials, a total of five parameters are sufficient to fully describe the dependence of both n and k on photon energy, E. For crystalline materials which have multiple peaks in their n and k spectra, the Forouhi–Bloomer dispersion equations can be extended as follows: [math]\displaystyle{ k(E) = \sum_{i=1}^q \left [\frac{A_i(E - E_{g_i})^2}{E^2-B_iE+C_i} \right] }[/math] [math]\displaystyle{ n(E) = n(\infty)+\sum_{i=1}^q \left [\frac{B_{0_i}E+C_{0_i}}{E^2-B_iE+C_i} \right] }[/math] The number of terms in each sum, q, is equal to the number of peaks in the n and k spectra of the material. Every term in the sum has its own values of the parameters A, B, C, Eg, as well as its own values of B0 and C0. Analogous to the amorphous case, the terms all have physical significance.
  • 9.0K
  • 31 Oct 2022
Topic Review
Placenta Accreta
Placenta accreta occurs when all or part of the placenta attaches abnormally to the myometrium (the muscular layer of the uterine wall). Three grades of abnormal placental attachment are defined according to the depth of attachment and invasion into the muscular layers of the uterus: Because of abnormal attachment to the myometrium, placenta accreta is associated with an increased risk of heavy bleeding at the time of attempted vaginal delivery. The need for transfusion of blood products is frequent, and surgical removal of the uterus (hysterectomy) is sometimes required to control life-threatening bleeding. Rates of placenta accreta are increasing. As of 2016, placenta accreta affects an estimated 1 in 272 pregnancies.
  • 1.0K
  • 28 Oct 2022
Topic Review
Salt Lake, Hawaii
Salt Lake is a neighborhood of Honolulu, Hawaii on the island of O‘ahu. The area is also known as Āliamanu after a nearby crater, although Salt Lake itself is in a crater called Ālia pa‘akai — meaning "salt pond" in the Hawaiian language. The Salt Lake community was developed in the 1960s during a construction boom, providing residents with an expansive view of downtown Honolulu and the sugarcane plantations of the central plain of O‘ahu. It is a community of high-rise condominiums, mid-rise town-dwellings, and houses snaking around the remnants of a now freshwater lake. The U.S. Postal Code for Salt Lake is 96818. Salt Lake is a part of the 15th District of the Hawaii Senate, currently represented by State Senator Glenn Wakai and the 32nd District of the Hawaii House of Representatives, currently represented by Linda Ichiyama. It is also a part of Council District VII of the City and County of Honolulu, currently represented by Radiant Cordero.
  • 951
  • 28 Oct 2022
Topic Review
Smiley V. Citibank (South Dakota), N. A.
Smiley v. Citibank, 517 U.S. 735 (1996), is a U.S. Supreme Court decision upholding a regulation of the Comptroller of Currency which included credit card late fees and other penalties within the definition of interest and thus prevented individual states from limiting them when charged by nationally-chartered banks. Justice Antonin Scalia wrote for a unanimous court that the regulation was reasonable enough under the Court's own Chevron standard for the justices to defer to the Comptroller. The decision, which had begun as a class action in California, was seen as a victory for banks and credit-card issuers, who could mostly charge late fees as they pleased. For that same reason consumer advocates were displeased, warning that late fees could rise to previously unseen levels. They did, and one of the Citibank attorneys has expressed regret for his involvement.
  • 588
  • 28 Oct 2022
  • Page
  • of
  • 863

Other Entry Collections

>>