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American Association for the Advancement of Science (1993). Benchmarks for science literacy. New York: Oxford University Press. ISBN 9780195089868. Bruton, Sheila; Ong, Faye (2000). Science content standards for California public schools : kindergarten through grade twelve (PDF). Sacramento, Calif.: Dept. of Education. ISBN 978-0-8011-1496-0
SIMS requires a high vacuum with pressures below 10 −4 Pa (roughly 10 −6 mbar or torr). This is needed to ensure that secondary ions do not collide with background gases on their way to the detector (i.e. the mean free path of gas molecules within the detector must be large compared to the size of the instrument), and it also limits surface ...
The Physical Science Study Committee (PSSC) was inaugurated at a 1956 conference at MIT to review introductory physics education and to design, implement, and monitor improvements. It produced major new physics textbooks, instructional movies, and classroom laboratory materials, which were used by high schools around the world during the 1960s ...
A mass spectrometer consists of three components: an ion source, a mass analyzer, and a detector. The ionizer converts a portion of the sample into ions. There is a wide variety of ionization techniques, depending on the phase (solid, liquid, gas) of the sample and the efficiency of various ionization mechanisms for the unknown species.
In order to achieve precise isotope measurements, there is a need for high transmission and high mass resolution. High transmission refers to the low loss of secondary ions between the sample surface and the detector, and high mass resolution refers to the ability to efficiently separate the secondary ions (or molecules of interest) from other ...
By Andrew Goudsward. WASHINGTON (Reuters) -A lead prosecutor on the criminal case accusing Donald Trump of illegally holding onto classified documents has left the U.S. Justice Department ahead of ...
Global efforts to address climate change will be dealt a severe blow if U.S. President-elect Donald Trump again pulls the country out of the Paris Agreement, the EU's head of climate change policy ...
Taylor says students from all different backgrounds are finding a place to learn at Taylor'd Cosmetology. "We have 60% Black, about 30% Latino and about 10% White," Taylor said.
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