Sentences with phrase «deuterium at»

Limiting the amount of cool deuterium at the edge of the plasma reduces the difference in temperature between the hot plasma center and the cooler edge, and reduces turbulence.

But without exposure to oxygen, lithium films could retain deuterium at higher temperatures as a result of lithium - deuterium bonding during a PPPL experiment.

But without exposure to oxygen, the researchers found, lithium films could retain deuterium at higher temperatures as a result of lithium - deuterium bonding.

With this labeling method, the intrinsically labeled Golden Rice β - carotene showed a protonated molecule of m / z of Mβc + H + = 536 + 1 (representing unlabeled β - carotene) and a range of isotopomers with the most abundant showing an enrichment of 9 deuterium at Menrich - βc = Mβc + H + + 9 mass units (Figure 4) as analyzed by using the liquid chromatography / mass spectrometry with a positive atmospheric pressure chemical ionization interface (the total m / z was Mβc + 9 + H + = 536 + 9 + 1 = m / z 546)(23).

Not exact matches

At opposite ends of the sphere, capacitors power larger injectors which heat a plasma fuel mix of deuterium and tritium to 1 million degrees Celsius.

Demonstration of High Performance in Layered Deuterium - Tritium Capsule Implosions in Uranium Hohlraums at the National Ignition Facility

Experimental results of radiation - driven, layered deuterium - tritium implosions with adiabat - shaped drives at the National Ignition Facility

Using multiple secondary fusion products to evaluate fuel rho R, electron temperature, and mix in deuterium - filled implosions at the NIF

Deuterium - tritium neutron yield measurements with the 4.5 m neutron - time - of - flight detectors at NIF

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.

Deuterium, helium, and lithium nuclei each absorb and emit light in a unique way, allowing scientists to point telescopes at I Zwicky 18 and determine the abundances of ancient nuclei very accurately.

Using a Cameca NanoSIMS 50L multicollector ion microprobe at Carnegie, the researchers measured the amount of deuterium in the samples compared to the amount of regular hydrogen.

What's more, the deuterium content was highest at the end of the Amazon's dry season, during the «greening» period when photosynthesis was strongest.

But when Ilsedore Cleeves at the University of Michigan and her team created a model of the early sun they found this couldn't have happened: once the ice was split, the oxygen became locked in frozen carbon monoxide and not enough ionised, deuterium - rich hydrogen was made.

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.

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.

But when Curiosity's Sample Analysis at Mars experiment (SAM) vaporised Martian soil, it found a ratio five times higher: one deuterium for every 1284 hydrogens.

Experiments further showed that exposing the lithium to oxygen improved deuterium retention at temperatures below about 400 degrees Kelvin.

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.

As the deuterium ions crowd together, they eventually fuse at a maximum rate of a million - billion reactions per second, he says.

Clarke will present IUVS measurements of hydrogen and deuterium — a form of hydrogen that contains a neutron and is heavier — on Oct. 19 at the planetary conference.

Here at Los Alamos, he and colleagues are now working on better ways to create and manipulate the deuterium plasma.

Hydrogen itself just has a proton at its nucleus; if you have a proton and a neutron that's called deuterium.

The issue first raised its head in 2015, when a team led by Edmund Myers at Florida State University measured the difference in masses of the nucleus of a helium - 3 atom and a deuteron — the nucleus of a deuterium or heavy hydrogen atom — with a single proton bound to...

The team will then shoot beams of various neutron - rich ions at a plastic target full of deuterium, a heavy form of hydrogen in which the nucleus contains a proton and a neutron.

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

The school will be structured around lectures delivered by members of CNL's research team and external experts in the mornings, followed by demonstrations and practical sessions in the afternoons during which students will spend time at the Zero Energy Deuterium (ZED - 2) reactor, as well as several other nuclear facilities located on the campus.

At electrical breakdown, the energies in the surging electrons were thousands of times greater than 10 — 19 MeV, so during the flood, bremsstrahlung radiation released a sea of neutrons throughout the crust.83 Subterranean water absorbed many of these neutrons, converting normal hydrogen (1H) into heavy hydrogen (2H, called deuterium) and normal oxygen (16O) into 18O.

Finally, Webb will look at ratios of heavy water — water molecules that contain a deuterium atom instead of hydrogen — to water in the planet - forming disks, helping trace how the water formed and under what conditions.

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

He came to the Laboratory during a challenging time when the Lab was preparing the TFTR for experiments with deuterium and tritium, recalls Dale Meade, who was deputy director at that time.

He developed a rule - based molecular mechanics force field as a Miller Fellow at the University of California, Berkeley, and studied hydrogen / deuterium - exchange reactions in proteins as a postdoctoral fellow with Robert Baldwin at Stanford University School of Medicine.

The afternoon sessions on water isotopes in precipitation was quite exciting because of the number of people looking at innovative proxy archives, including cave records of 18O in calcite, or deuterium in leaf waxes, which are extending the coverage (in time and space) of this variable.

The end of the first half of the Holocene — between about 5 and 4 ka — was punctuated by rapid events at various latitudes, such as an abrupt increase in NH sea ice cover (Jennings et al., 2001); a decrease in Greenland deuterium excess, reflecting a change in the hydrological cycle (Masson - Delmotte et al., 2005b); abrupt cooling events in European climate (Seppa and Birks, 2001; Lauritzen, 2003); widespread North American drought for centuries (Booth et al., 2005); and changes in South American climate (Marchant and Hooghiemstra, 2004).

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!

Masson - Delmotte et al. (2005) highlight an abrupt drop in GRIP deuterium excess at 4.5 ka, and suggest that this change in isotopes of precipitation over central Greenland may have recorded a shift in regional hydroclimate.

The Vostok or EPICA ice cores deep in Antarctica use the deuterium ratio's because those will resolve at that distance since so little heavy oxygen makes it that far.