environmental sample

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• Environmental radioactivity — is produced by radioactive materials in the human environment. While some radioisotopes, such as strontium 90 (90Sr) and technetium 99 (99Tc), are only found on Earth as a result of human activity, and some, like potassium 40 (40K), are only… …   Wikipedia

• Sample size determination — is the act of choosing the number of observations to include in a statistical sample. The sample size is an important feature of any empirical study in which the goal is to make inferences about a population from a sample. In practice, the sample …   Wikipedia

• Environmental stress cracking — (ESC) is one of the most common causes of unexpected brittle failure of thermoplastic (especially amorphous) polymers known at present. Environmental stress cracking may account for around 15 30% of all plastic component failures in service.H. F …   Wikipedia

• sample preparation — ▪ chemistry Introduction  in analytical chemistry (chemistry), the processes in which a representative piece of material is extracted from a larger amount and readied for analysis. Sampling and sample preparation have a unique meaning and special …   Universalium

• Environmental Principles and Policies — The book Environmental Principles and Policies: An Interdisciplinary Introduction , written by Professor Sharon Beder, examines six key environmental and social principles that have been incorporated into international treaties and national laws …   Wikipedia

• Environmental scanning electron microscope — Wool fibers imaged in an ESEM by the use of two symmetrical plastic scintillating backscattered electron detectors …   Wikipedia

• Environmental impact of wind power — Livestock ignore wind turbines,[1] and continue to graze as they did before wind turbines were installed. Compared to the environmental impact of traditional energy sources, the environmental impact of wind power is relatively minor. Wind power… …   Wikipedia

• Environmental chamber — Example of temperature/humidity chamber. An environmental chamber is an enclosure used to test the effects of specified environmental conditions on biological items, industrial products, materials, and electronic devices and components.… …   Wikipedia

• Environmental effects of wind power — Compared to the environmental effects of traditional energy sources, the environmental effects of wind power are relatively minor. Wind power consumes no fuel, and emits no air pollution, unlike fossil fuel power sources. The energy consumed to… …   Wikipedia

• Environmental audio extensions — The environmental audio extensions (or EAX) are a number of digital signal processing presets for audio, present in Creative Labs later Sound Blaster sound cards and the Creative NOMAD/Creative Zen product lines. EAX displaced the alternative A3D …   Wikipedia

• Measured environmental concentration — An Measured Environmental Concentration (MEC) relates to a chemical substance found in an environmental sample. The concentration of the compound may result from direct contamination, transformation and/or metabolization of an different chemical… …   Wikipedia