20 results found for gases

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00:31:00

The Adventure of Cold Atoms. From Optical Pumping to Quantum Gases

by Claude Cohen-Tannoudji
The Adventure of Cold Atoms. From Optical Pumping to Quantum Gases
for 18-22 and upwards,
Lectures | 18-22 and upwards | 8 years ago | 1328 views
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Conservation laws are very important in quantum physics. Two examples of applications will be given. First, optical pumping which uses transfer of angular momentum from polarized photons to atoms to produce highly polarized atomic gases. Then, laser ....

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00:30:00

Global Warming Revisited

by Ivar Giaever
Global Warming Revisited
for 18-22 and upwards,
Lectures | 18-22 and upwards | 8 years ago | 1537 views
Rating:

Because of the following statement from the American Physical Society: “The evidence is incontrovertible: Global warming is occurring. If no mitigating actions are taken, significant disruptions in the Earth's physical and ecological systems, s....

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00:07:00

Solids, Liquids and Gases

by Tom Yates
Solids, Liquids and Gases
for 14-19 and upwards,
Highschool presentations | 14-19 and upwards | 8 years ago | 1178 views
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Tom looks at the intriguing differences between three states of matter

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00:33:00

Cold Atomic Gases: the Intersection of Condensed Matter and Atomic Physics

by William Phillips
Cold Atomic Gases: the Intersection of Condensed Matter and Atomic Physics
for 18-22 and upwards,
Lectures | 18-22 and upwards | 9 years ago | 1556 views
Rating:

During the past decade laser cooling and evaporative cooling of atoms have produced quantum degenerate gases both of bosons (Bose-Einstein condensates) and of fermions (gases with temperatures below the Fermi temperature). Such gases can provide ana....

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00:31:00

Atmosphere Climate and Chemistry in the Anthropocene

by Paul Crutzen
Atmosphere Climate and Chemistry in the Anthropocene
for 18-22 and upwards,
Lectures | 18-22 and upwards | 9 years ago | 1346 views
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Despite their relatively small mass, 10-5% of the earth biosphere as a whole, generations of ambitious 'homo sapiens' have already played a major and increasing role in changing basic properties of the atmosphere and the earth's surface. Human activ....

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00:34:00

Greenhouse Gases and Climate Change

by Sherwood Rowland
Greenhouse Gases and Climate Change
for 18-22 and upwards,
Lectures | 18-22 and upwards | 9 years ago | 1580 views
Rating:

The 'greenhouse gases (GHG)' intercept a fraction of outgoing terrestrial infrared radiation, creating the natural greenhouse effect which warmed the atmosphere by approximately 32 Celsius at the beginning of the 20th Century. The activities of manki....

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00:23:00

Atmospheric Chemistry and Climate in the Anthropocene

by Paul Krutzen
Atmospheric Chemistry and Climate in the Anthropocene
for 18-22 and upwards,
Lectures | 18-22 and upwards | 9 years ago | 1253 views
Rating:

Despite their relatively small mass, 10% of the earth biosphere as a whole, generations of ambitious ‘homo sapiens’ have already played a major and increasing role in changing basic properties of the atmosphere and the earth’s surface.  Human ....

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00:30:00

Photosynthesis, Biomass, Biofuels: Conversion Efficiencies and Consequences

by Hartmut Michel
Photosynthesis, Biomass, Biofuels: Conversion Efficiencies and Consequences
for 18-22 and upwards,
Lectures | 18-22 and upwards | 9 years ago | 1304 views
Rating:

It is generally accepted that the global warming, which we undoubtedly observe, is the result of an increased concentration of greenhouse gases like carbon dioxide and methane in the atmosphere.  Within this scenario it is evident that we have to re....

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00:31:00

Creating Artificial Magnetic Fields to Act on Neutral Atoms

by William Phillips
Creating Artificial Magnetic Fields to Act on Neutral Atoms
for 18-22 and upwards,
Lectures | 18-22 and upwards | 9 years ago | 1557 views
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Cold, quantum degenerate gases of neutral atoms have proved to be useful in simulating the behavior of quantum systems like electrons in solids.  For example, cold atoms moving in optical lattices (periodic potentials created by interfering laser be....

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01:15:00

The Nuclear Debate

by Various Presenters
The Nuclear Debate
for 14-19 and upwards,
Lectures | 14-19 and upwards | 11 years ago | 1729 views
Rating:

New carbon targets requires reducing emissions of greenhouse gases by 50% for 2030. This house believes that it will be impossible to meet the emissions reductions required to fulfil these obligations without the use of nuclear power.  Taking the pr....

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00:04:00

Real Gases

by Morgan Jefferis
Real Gases
for 14-19 and upwards,
Highschool presentations | 14-19 and upwards | 11 years ago | 3287 views
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A light-hearted look at the difference between real and ideal gases.

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00:10:00

Producing Biogas and Identifying Bacteria

by Yuji Sunaoshi
Producing Biogas and Identifying Bacteria
for 14-19 and upwards,
Highschool presentations | 14-19 and upwards | 11 years ago | 10195 views
Rating:

Bacteria which adhere to plants have ability to produce gases such as hydrogen, methane or ammonia. These are called biogas. Biogas is recognized as new and clean source of energy. I wanted to know what kind of bacteria produce biogas. I isolated bac....

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