" The Java Swing GUI library. More recently there have been attempts to apply MVC architectures for web-based interfaces . In the design of web applications, MVC is also known as a "Model 2" architecture in Sun parlance. Complex web applications continue to be more difficult to design than traditional applications, and MVC is being pushed as a potential solution to these difficulties. Beware: many applications which claim to comply with this much misunderstood pattern in fact do not achieve the required separation of model and view. JavaServer Faces , Jakarta Struts and Webwork2 are currently the most popular web oriented MVC implementations. Struts works at a page level; JSF works at a component level . Fitness Magazine Model The WebObjects development/deployment environment is strongly based on MVC. Fusebox Mach-II Maypole Catalyst Tapestry ZNF Apache Cocoon Ruby on Rails General information Description in the Portland Pattern Repository Core J2EE Patterns - Front Controller Dicussion of JavaServer Pages Model 2 architecture MVC-Frameworks written in PHP () Holub, Allen: “Building user interfaces for object-oriented systems�, Java World, 1999. "

" The Standard Model The Standard Model contains both fermionic and bosonic fundamental particles. Fermions are particles which possess half-integer spin and obey the Pauli exclusion principle, which states that no fermions can share the same quantum state. Bosons possess integer spin and do not obey the Pauli exclusion principle. Informally speaking, fermions are particles of matter and bosons are particles that transmit forces. For a detailed description of the differences between fermions and bosons, see the article on identical particles. In the Standard Model, the theory of the electroweak interaction (which describes the weak and electromagnetic interactions) is combined with the theory of quantum chromodynamics. All of these theories are gauge theories, meaning that they model the forces between fermions by coupling them to bosons which mediate (or "carry") the forces. Diet Fitness Model The Lagrangian of each set of mediating bosons is invariant under a transformation called a gauge transformation, so these mediating bosons are referred to as gauge bosons. The bosons in the Standard Model are: Unsolved problems in physics: Parameters in the Standard Model: What gives rise to the Standard Model of particle physics? Why do its particle masses and coupling constants possess the values we have measured? Does the Higgs boson predicted by the model really exist? Why are there three generations of particles in the Standard Model? Is the Standard Model reality, a good approximation to reality, or fatally flawed? Photons, which mediate the electromagnetic interaction. "