Sentences with phrase «hydrogen isotopes at»

Not exact matches

Scientists can determine where an individual piece of meat comes from using a technique called isotope analysis, looking at the specific fingerprints of carbon, hydrogen, and nitrogen atoms to see where a cow lived.

Harold Urey, a chemist at Columbia University, speculated that an isotope lugging around an extra neutron would weigh enough to be distilled from normal hydrogen.

The composition of these ice cores, especially the presence of hydrogen and oxygen isotopes, provides a picture of the climate at the time.

By looking at the chemistry of rocks deposited during that time period, specifically coupled carbon and sulfur isotope data, a research team led by University of California, Riverside biogeochemists reports that oxygen - free and hydrogen sulfide - rich waters extended across roughly five percent of the global ocean during this major climatic perturbation — far more than the modern ocean's 0.1 percent but much less than previous estimates for this event.

The method takes advantage of varying levels of carbon and hydrogen isotopes in the soil, water, and vegetation at different latitudes.

Under laboratory conditions it is the two hydrogen isotopes — deuterium and tritium — that fuse most readily when held as a plasma at temperatures of several hundred million degrees.

Inertial confinement fusion (ICF) seeks to create those conditions by taking a tiny capsule of fusion fuel (typically a mixture of the hydrogen isotopes deuterium and tritium) and crushing it at high speed using some form of «driver,» such as lasers, particle beams, or magnetic pulses.

University of Utah physicists read the subatomic «spins» in the centers or nuclei of hydrogen isotopes, and used the data to control current that powered light in a cheap, plastic LED — at room temperature and without strong magnetic fields.

Herein we demonstrate that a photoredox - mediated hydrogen atom transfer protocol can efficiently and selectively install deuterium (D) and tritium (T) at α - amino sp3 carbon - hydrogen bonds in a single step, using isotopically labeled water (D2O or T2O) as the source of hydrogen isotope.

The aim of ITER is to show that, in theory, nuclei of deuterium and tritium (isotopes of hydrogen) can be fused in a searingly hot plasma at the heart of the reactor, thereby releasing large quantities of heat that could be used to generate power.

Scientists agree that tritium, a radioactive isotope of hydrogen, is key to obtaining a precise measurement: As a gas, tritium decays at such a rate that scientists can relatively easily observe its electron byproducts.

At the end of January, experiments will begin with hydrogen in an effort to show that fusing hydrogen isotopes can be a viable source of clean and virtually limitless energy.

The study by Louie Yang (Dept. Entomology at UC - Davis) used stable hydrogen isotope analysis to test tissue samples from 114 butterflies at 4 overwintering locations.

Deuterium (or heavy hydrogen) is a fragile isotope that can not survive the high temperatures achieved at the centers of stars.

First, I do think that there is a lot of work to be done in the interpretation of oxygen / hydrogen isotope values obtained at a site, and there's still plenty of disagreement in the paleo - community on how to best connect the isotopic signal in a record with climate.

Now news that two monitoring wells detected a spike in levels of tritium, a radioactive isotope of hydrogen, has raised important questions about the aging infrastructure at the complex.

First, I do think that there is a lot of work to be done in the interpretation of oxygen / hydrogen isotope values obtained at a site, and there's still plenty of disagreement in the paleo - community on how to best connect the isotopic signal in a record with climate.

They measure the hydrogen and oxygen isotopes to infer air temperatures at the time the snow fell, and the dust particles give a nice indication of the dusty periods (much of the dust was kicked up far away, in the Gobi Desert, rather than from sources closer to Greenland).

Who knows, maybe some people read the Wegman Report, look at Table 1, think it actually came as is from Bradley, and confidently write of 1) «ions and isotopes of oxygen and hydrogen», 2) «speleothrems» and 3) «phonology».

At that instant - theory says but experiments have yet to achieve - the hydrogen isotope atoms inside the target would fuse to become helium and release more energy in a trillionth of a second than it took to produce the blast in the first place.