Sentences with phrase «from deuterium»

The amount of energy available through fusion is extraordinary.Fusion energy is obtained by forcing together atomic nuclei from deuterium and tritium (another form of hydrogen).

In a recent paper in Science Express (19 June, 2008) Stevensen et al. estimate from deuterium isotopes in Greenland ice cores a the rise in about 4 degrees C at the Youngest dryas took place over a few years!

Red indicates light emitted from both deuterium and lithium, while yellow and orange show lithium line emission.

Travelling at 30,000 kilometres a second, the ions can capture extra neutrons from the deuterium, forming rare, exotic ions.

First, they used acetone made from deuterium, which is hydrogen with an extra neutron.

Not exact matches

Comparison between x-ray scattering and velocity - interferometry measurements from shocked liquid deuterium

Assembly of High - Areal - Density Deuterium - Tritium Fuel from Indirectly Driven Cryogenic Implosions

Meanwhile, science can characterize the content of deuterium (a hydrogen nucleus with a proton and a neutron) to the usual quality limits by looking at a spectra from 1000 hydrogen atoms.

The sun has a much lower deuterium concentration than our oceans, suggesting that much of Earth's water comes directly from the initial pre-solar cloud.

Urey and two colleagues then detected deuterium by its atomic spectrum in residue distilled from liquid hydrogen.

Fragments of the particles may have come from asteroids, too: deuterium - rich grains have been found in some meteorites (Science, vol 328, p 742).

To kick - start the reaction, the plan is to convert energy from high - power laser beams into heat and then X-rays, which will compress a pellet of deuterium and tritium to force the nuclei together.

According to the data from DASI, it amounts to a mere 4.5 percent of the universe's total mass and energya number that accords well with an estimate made in 1998 based on the amount of the element deuterium produced during the big bang.

To determine the ratios that would currently be found deep in the moon's interior, Van Orman and Saal modeled the loss of gasses from inside melt inclusions and the influence of degassing on the deuterium.

Because comets formed so far from the sun, they tend to have high deuterium / hydrogen ratios — much higher ratios than in the moon's interior, where the samples in this study originated.

Water molecules originating from different places in the solar system have different amounts of deuterium.

Aura found that the early moisture accumulating over the rainforest was high in deuterium — «too high to be explained by water vapor from the ocean,» Fu says.

Warmer air temperatures cause more water containing the heavier isotopes oxygen - 18 or deuterium to evaporate from the surrounding ocean.

Next, a photoredox catalyst strips a hydrogen atom equivalent from the carbon, and the thiol engages in radical chemistry to transfer the deuterium or tritium in its place.

Among the puzzles is how temperature affects the ability of lithium to absorb and retain the deuterium particles that stray from the fuel that creates fusion reactions.

Brown University's Alberto Saal and colleagues measured the ratio of hydrogen to deuterium (hydrogen with an extra neutron) in lunar rock samples from the Apollo missions.

Specifically, they measured hydrogen and its isotope, deuterium (hydrogen with an extra neutron in its nucleus) with ion microprobes, which use a focused beam of ions to sputter ions from a small rock sample into a mass spectrometer.

When the researchers applied a current to the cell, they thought deuterium atoms from heavy water that had penetrated into the palladium cathode were fusing to form helium atoms.

Odorants such as acetophenone and deuterated acetophenone, for example, have the same molecular structure; one is just built from a slightly heavier hydrogen atom, known as deuterium.

Its primary fuel — deuterium, a heavy version of hydrogen — can be extracted from seawater.

Under the machine's strong magnetic field, the protons left over from the neutron - stripped deuterium spiral backwards, landing nanoseconds later on a rod of silicon that will run along the centre of the chamber (see diagram).

Early Results from VLT - SPHERE: Long - Slit Spectroscopy of 2MASS 0122 - 2439B, a Young Companion Near the Deuterium Burning Limit

So, if large amounts of water had disappeared from Venus over the years, there should be a larger ratio of deuterium to regular water left behind.

Variations of deuterium (δD; black), a proxy for local temperature, and the atmospheric concentrations of the greenhouse gases CO2 (red), CH4 (blue), and nitrous oxide (N2O; green) derived from air trapped within ice cores from Antarctica and from recent atmospheric measurements (Petit et al., 1999; Indermühle et al., 2000; EPICA community members, 2004; Spahni et al., 2005; Siegenthaler et al., 2005a, b).

What the band left out was deuterium, the stepping stone stars use to get from hydrogen to helium.

A team of scientists from Pacific Northwest National Laboratory, Utah State University, Northwestern University, and the University of Utah sought to understand this H2 relaxation mechanism by monitoring the effects of hydrogen (H) vs deuterium (D) on the kinetics of H2 formation when nitrogenase is attached to an electrode.

This will be done using deuterium exchange mass spectrometry to identify the structural characteristics and conformational rigidity of nucleosomes assembled from 1) CENP - A, 2) histone H3 or 3) histone H3 carrying the centromere targeting domain of CENP - A.

Serving as the main point of contact with plasma enables the lithium to absorb the hot deuterium ions that drift from the center of the plasma, and keeps them from striking the interior walls of the tokamak and cooling down.

Assembly of high - areal - density deuterium - tritium fuel from indirectly driven cryogenic implosions.

The temperature record is inferred from hydrogen / deuterium ratios in the ice itself.

The basic fuel for fusion is deuterium, a form of hydrogen easily separated from ordinary seawater.

... The paper, entitled «Recent Antarctic Peninsula warming relative to Holocene climate and ice — shelf history» and authored by Robert Mulvaney and colleagues of the British Antarctic Survey (Nature, 2012, doi: 10.1038 / nature11391), reports two recent natural warming cycles, one around 1500 AD and another around 400 AD (William: Same periodicity of cyclic warming and cooling in the Northern hemisphere), measured from isotope (deuterium) concentrations in ice cores bored adjacent to recent breaks in the ice shelf in northeast Antarctica.

The 8 ppmv/degr.C comes from ice cores, where the ratio between a temperature proxy (deuterium against hydogen or 18O / 16O) and CO2 level is quite linear over 800,000 years.

Lower curve: reconstruction of atmospheric temperature from measurements of the isotope Deuterium.

or from evaporated fresh water which already has a reduced amount of deuterium?

In a deuterium - moderated - reactor, fuel made from natural uranium (0.71U - 235) can sustain a chain reaction.

Human civilization can flourish for centuries and millennia on energy delivered from a closed uranium or thorium fuel cycle, or from hydrogen - deuterium fusion.

«[Siegenthaler et al. (2005)-RSB- analyzed CO2 and proxy temperature (äD, the ratio of deuterium to hydrogen) data derived from an ice core in Antarctica.

For fusion, the fuel is two isotopes of hydrogen, deuterium and tritium, the first of which can be extracted from seawater and the second from lithium, whose resources are large and growing.

New insights into Southern Hemisphere temperature changes from Vostok ice cores using deuterium excess correction.