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An early life stage (ELS) test is a chronic toxicity test using sensitive early life stages like embryos or larvae to predict the effects of toxicants on organisms. [1] ELS tests were developed to be quicker and more cost-efficient than full life-cycle tests, taking on average 1–5 months to complete compared to 6–12 months for a life-cycle test.
Life-cycle assessment (LCA or life cycle analysis) is a technique used to assess potential environmental impacts of a product at different stages of its life. This technique takes a "cradle-to-grave" or a "cradle-to-cradle" approach and looks at environmental impacts that occur throughout the lifetime of a product from raw material extraction, manufacturing and processing, distribution, use ...
Life cycle energy analysis (LCEA) is an approach in which all energy inputs to a product are accounted for, not only direct energy inputs during manufacture, but also all energy inputs needed to produce components, materials and services needed for the manufacturing process. [110] With LCEA, the total life cycle energy input is established. [111]
The MIT School of Science is one of the five schools of the Massachusetts Institute of Technology, located in Cambridge, Massachusetts, United States.The School, which consolidated under the leadership of Karl Taylor Compton in 1932, is composed of 6 academic departments who grant SB, SM, and PhD or ScD degrees; as well as a number of affiliated laboratories and centers.
After the 1997 alcohol-related death of Scott Krueger, a new pledge at the Phi Gamma Delta fraternity, MIT required all freshmen to live in the dormitory system starting in 2002. [160] Because FSILGs had previously housed as many as 300 freshmen off-campus, the new policy could not be implemented until Simmons Hall opened in that year. [161]
Some high schools, to reflect the varying skill required for different course levels, will give higher numerical grades for difficult courses, often referred to as a weighted GPA. For example, two common conversion systems used in honors and Advanced Placement courses are: A = 5 or 4.5; B = 4 or 3.5 [5] C = 3 or 2.5; D = 2 or 1.5; F = 0 [19]
Life cycle engineering is defined in the CIRP Encyclopedia of Production Engineering as: "the engineering activities which include the application of technological and scientific principles to manufacturing products with the goal of protecting the environment, conserving resources, encouraging economic progress, keeping in mind social concerns, and the need for sustainability, while optimizing ...
Grading in education is the application of standardized measurements to evaluate different levels of student achievement in a course. Grades can be expressed as letters (usually A to F), as a range (for example, 1 to 6), percentages, or as numbers out of a possible total (often out of 100).