Wonderland Model
Wonderland is an integrated mathematical model used for studying phenomena in sustainable development. First introduced by economist ( Waren C. Sanderson 1994) of Stony Brook University, there are now several related versions of the model in use. Wonderland allows economists, policy analysts and environmentalist to study the interactions between the economic, demographic and anthropogenic sectors of an idealized world, thereby enabling them to obtain insights transferable to the real world. Introduction Wonderland is a compact model. In total, there are only four continuous state variables, one each for the economic and demographic sectors and two for the anthropogenic sector; thus making Wonderland more compact and amenable to analysis than larger, more intricate models like World3. For this reason it is often used as an initial testing ground for new techniques in the area of policy analysis ( Lempert, et al., 2003). Governing equations Denote the four state variables ...
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Mathematical Model
A mathematical model is a description of a system using mathematical concepts and language. The process of developing a mathematical model is termed mathematical modeling. Mathematical models are used in the natural sciences (such as physics, biology, earth science, chemistry) and engineering disciplines (such as computer science, electrical engineering), as well as in non-physical systems such as the social sciences (such as economics, psychology, sociology, political science). The use of mathematical models to solve problems in business or military operations is a large part of the field of operations research. Mathematical models are also used in music, linguistics, and philosophy (for example, intensively in analytic philosophy). A model may help to explain a system and to study the effects of different components, and to make predictions about behavior. Elements of a mathematical model Mathematical models can take many forms, including dynamical systems, statisti ...
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Scenario Analysis
Scenario planning, scenario thinking, scenario analysis, scenario prediction and the scenario method all describe a strategic planning method that some organizations use to make flexible long-term plans. It is in large part an adaptation and generalization of classic methods used by military intelligence. In the most common application of the method, analysts generate simulation games for policy makers. The method combines known facts, such as demographics, geography and mineral reserves, with military, political, and industrial information, and key driving forces identified by considering social, technical, economic, environmental, and political ("STEEP") trends. In business applications, the emphasis on understanding the behavior of opponents has been reduced while more attention is now paid to changes in the natural environment. At Royal Dutch Shell for example, scenario planning has been described as changing mindsets about the exogenous part of the world prior to formulating ...
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Springer Science+Business Media
Springer Science+Business Media, commonly known as Springer, is a German multinational publishing company of books, e-books and peer-reviewed journals in science, humanities, technical and medical (STM) publishing. Originally founded in 1842 in Berlin, it expanded internationally in the 1960s, and through mergers in the 1990s and a sale to venture capitalists it fused with Wolters Kluwer and eventually became part of Springer Nature in 2015. Springer has major offices in Berlin, Heidelberg, Dordrecht, and New York City. History Julius Springer founded Springer-Verlag in Berlin in 1842 and his son Ferdinand Springer grew it from a small firm of 4 employees into Germany's then second largest academic publisher with 65 staff in 1872.Chronology
". Springer Science+Business Media. In 1964, Springer expanded its business internationally, o ...
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Physica A
Physica may refer to: * Physics (Aristotle) The ''Physics'' (Ancient Greek, Greek: Φυσικὴ ἀκρόασις ''Phusike akroasis''; Latin: ''Physica'', or ''Naturales Auscultationes'', possibly meaning "Natural philosophy, lectures on nature") is a named text, written in ancient G ...

Differential Equations
In mathematics, a differential equation is an equation that relates one or more unknown functions and their derivatives. In applications, the functions generally represent physical quantities, the derivatives represent their rates of change, and the differential equation defines a relationship between the two. Such relations are common; therefore, differential equations play a prominent role in many disciplines including engineering, physics, economics, and biology. Mainly the study of differential equations consists of the study of their solutions (the set of functions that satisfy each equation), and of the properties of their solutions. Only the simplest differential equations are solvable by explicit formulas; however, many properties of solutions of a given differential equation may be determined without computing them exactly. Often when a closed-form expression for the solutions is not available, solutions may be approximated numerically using computers. The theory of d ...
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Finite Difference Equation
A finite difference is a mathematical expression of the form . If a finite difference is divided by , one gets a difference quotient. The approximation of derivatives by finite differences plays a central role in finite difference methods for the numerical solution of differential equations, especially boundary value problems. The difference operator, commonly denoted \Delta is the operator that maps a function to the function \Delta /math> defined by :\Delta x)= f(x+1)-f(x). A difference equation is a functional equation that involves the finite difference operator in the same way as a differential equation involves derivatives. There are many similarities between difference equations and differential equations, specially in the solving methods. Certain recurrence relations can be written as difference equations by replacing iteration notation with finite differences. In numerical analysis, finite differences are widely used for approximating derivatives, and the term "fi ...
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Hbll05
The Harold B. Lee Library (HBLL) is the main academic library of Brigham Young University (BYU) located in Provo, Utah. The library started as a small collection of books in the president's office in 1876 before moving in 1891. The Heber J. Grant Library building was completed in 1925, and in 1961 the library moved to the newly constructed J. Reuben Clark Library where it stands today. That building was renamed to the Harold B. Lee Library in 1974. The library was significantly expanded in the 1990s, providing new individual and group study rooms and a special vault area for the L. Tom Perry Special Collections Library. In 2016, the library contained over 4.7 million books, 10.6 million total materials, and served over 10,000 patrons each day. The HBLL was ranked by the Princeton Review within the top three university libraries in the United States three times: in 2004, 2007, and 2012. History A collection of books in Karl G. Maeser’s office served as the first library at Br ...
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Lh02
LH or lh may refer to: Arts and entertainment *Laurel and Hardy, a comedy double act during the early Classical Hollywood era of American cinema * "Little Hide", 1998 single by Snow Patrol *Lovehammers, a Chicago-based band *''Love Hina'', a 1998 popular manga (and anime) series by author Ken Akamatsu *''The Lurking Horror'', an interactive fiction game released in 1987 Businesses and organizations *Korea Land and Housing Corporation, a South Korean state-owned housing company *LabCorp (stock symbol LH), a clinical laboratory company *Lernout & Hauspie, a former Belgium-based speech and language technology company *''Lifehacker'', a blog website owned by Gawker Media *Literary and Historical Society (University College Dublin) *Lufthansa (IATA airline designator), large European airline Places *Le Havre, a French city *Lincoln Highway, in the US *Locks Heath, a suburb of Fareham, UK *County Louth, Ireland (code LH) Science and technology * LH, a type of single-mode optical fiber ...
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