Sentences with phrase «for nucleation»

So what is needed for nucleation to occur?

High ozone levels downstream of pollution sources can cause elevated OH radical concentrations, which in turn increases the concentration of condensable species and thus the potential for nucleation.

And it is useful to recall K's comment, which pointed out that there was no accurate model for the nucleation germ growth.

Lastly, in the standard version of the model, H2SO4 partitions into existing particles or forms new particles if the concentrations exceed those for nucleation (23).

These results have implications for nucleation in many solid - solid transitions and the structure of the final state.

The structure and depth of the indicated minimum remain unknown, as well as the height of the activation barrier for nucleation.

If these bubbles persist, they could hasten the formation of future hydrates by providing sites for nucleation.

It's well known that particles in the atmosphere such as mineral dust, pollen, heavy metals and even bacteria can act as seeds for the nucleation of ice crystals.

As the atoms move around in the supercooled state in search for nucleation sites, the temperature continues to drop.

Not exact matches

Franc plans to start testing them soon, looking for the DNA sequences involved in ice nucleation.

In the established FEBID process, an electron beam is used to write structures from molecules adsorbed onto a solid surface that provides support and nucleation sites for deposit growth.

These lower the freezing point of their body fluids as winter approaches by synthesising antifreeze molecules and getting rid of anything that could act as a nucleation site for ice crystals to form around, such as gut contents and bacteria.

So that you know, these are little combustible particles in soot etcetera, into the atmosphere and these particles act as nucleation for clouds and the clouds are reflective.

S11) gives a possible basis for structural preformation and the nucleation of different ACC species discussed above, which later transform into the particular crystalline polymorph.

S15) and suggests a similar nucleation mechanism for these minerals.

The team found that this ice nucleation protein, inaZ, acts as a mold for ice crystals.

Engineers at Washington University in St. Louis experimentally proved how the confined collagen structure contributes to reducing thermodynamic energy barrier to intrafibrillar nucleation for bone mineralization.

Jun and Doyoon Kim, a doctoral student in her lab, studied how miniscule gaps in collagen's fiber structure facilitate the nucleation of calcium phosphate, which is necessary for bone formation and maintenance.

A team of researchers led by Dr. Mike Sleutel from the VIB - VUB Center for Structural Biology in collaboration with scientists from the Institute for Complex Molecular Systems of the Eindhoven University of Technology, and the CNRS in Grenoble, have for the first time uncovered the molecular details of protein crystal nucleation, a process with great medical and scientific relevance.

But the nucleation barrier for metal - at the extraordinary pressures at the center of the Earth - is enormous.

Nanofibers made of polymer were supersonically blown onto the chips, creating a nanotexture for increased bubble nucleation.

A weakening magnetic field might lead to more cloud formation because more air molecules would be ionized by incoming high - energy radiation, and ionized air molecules are nucleation sites for cloud droplets.

«People can see, for example, condensation, nucleation, dissolution, or deposition of material, and how these happen in real - time — things that people have never seen before,» Youcef - Toumi says.

Located in an area that has ruptured six times since 1857, the hole provided the first opportunity to observe directly the conditions under which earthquakes occur, to collect rocks and fluids from the fault zone for laboratory study, and to continuously monitor the physical condition within an active earthquake nucleation zone.

The structural investigations of model organic systems like pentacene in the monolayer regime is very important for fundamental understanding of the initial nucleation process together with the electronic performance of transistor devices.

It takes a certain finite amount of time for the initial crystals to form, a process called nucleation.

The Wang and Ma labs have discovered the structural basis for actin nucleation.

So my take on this, is that the paper only really shows that the nature of the ionizing particles is not important for the ion - induced component of the nucleation.

Prior to the publication of the aerosol nucleation results from the CLOUD experiment at CERN in Nature several weeks ago Kirkby et al, 2011, I was asked by Nature Geoscience to write a «News and Views» on the CLOUD results for a general science audience.

I'm not into cloud physics in any way, which is why I ask the question, but I'm was once well acquainted with supercooling and the need for heterogeneous nucleation in most things material.

In a phase transition from liquid to solid, a liquid may persist in a supercooled state beyond the equilibrium threshold for solidification if there are insufficient nucleation points (e.g., impurities) to induce solidification.

«Because the primary source of ions in the global troposphere is galactic cosmic rays (GCRs), their role in atmospheric nucleation is of considerable interest as a possible physical mechanism for climate variability caused by the Sun.»

But just to be even clearer, in plain English, what this means is that for the most part it appears that galactic cosmic rays significantly increase the formation of cloud nucleation, the formation of a seed about which vapor can condense, perhaps orders of magnitude more than previously known.

«Experimental Evidence for the Role of Ions in Particle Nucleation under Atmospheric Conditions.»

Increased numbers of aerosols provide additional locations for droplet nucleation and, all else being equal, result in clouds with more and smaller droplets hence being more reflective to solar radiation (a cooling effect).

Määttänen A., J. Merikanto, H. Henschel, J. Duplissy, R. Makkonen, I.K. Ortega, and H. Vehkamaki (2017), New parameterizations for neutral and ion - induced sulfuric acid - water particle formation in nucleation and kinetic regimes, J. Geophys.

If Svensmark and other researchers are correct the switch between these states could be due to weakness in the solar wind leading to more galactic cosmic rays entering the atmosphere and increasing the nucleation for cloud droplets (just as in a «cloud chamber»).

Bacteria in the atmosphere, for instance, work as nucleation sites for water droplets.

These particles impact and shatter in the upper atmosphere causing a shower of particles that ostensibly form nucleation sites for water condensation into clouds.

Still, a more even distribution over the oceans might be good for climate regulation through DMS cloud nucleation and still be safe for humans in far off cities.

And the minimum temperatures (excluding in the days when the use of the ice nucleation chemicals are used, or used in more quantities) are being at least 4 to 6 degrees above the normal for all the seasons through out the year.

Most have never heard of «chemical ice nucleation for weather modification», but patents exist for this process and the Chinese government has long since admitted to engineering frozen precipitation events.

Chemical ice nucleation (for weather modification) is a patented process, the link below is important to review in order to gain a better understanding of this process.

c) have a viable hypothesis for a mechanism (nucleation of clouds through galactic cosmic rays, or GCR), which

Patented processes of «chemical ice nucleation for weather modification» (a primary aspect of climate engineering operations) will likely cause considerable surface icing scenarios as these materials reach ground level.

Svenmark's GCRs have been mentioned, but despite Kirkby claiming that the CERN / CLOUD experiment had NO implications for the GCR hypothesis of causing climate effects, I think the sentence in the abstract ---» We find that ion - induced binary nucleation of H2SO4 — H2O can occur in the mid-troposphere but is negligible in the boundary layer.»

The «Temperature Departure From Average» map below further reveals the areas of concentration for climate engineering orchestrated chemical cool - downs and sea surface chemical ice nucleation (also fueling extreme hail events).

As Fred has noted above, CERN CLOUD could provide support for the role of ionizing radiation in aerosol nucleation, but it won't change that assessment.

You would not want to fall for the false idea that someone actually knows more than K&C about the germ nucleation growth statistics.

As for the generalization of classical nucleation theory — about which he has not the slightest clue.