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hmyers96

HowStuffWorks "How Nuclear Fusion Reactors Work" - 0 views

science.howstuffworks.com/fusion-reactor2.htm

shared by hmyers96 on 03 Jun 14 - Cached
  • Deuterium-deuterium fusion requires higher temperatures that may be possible in the future. Ultimately, deuterium-deuterium fusion will be better because it is easier to extract deuterium from seawater than to make tritium from lithium. Also, deuterium is not radioactive, and deuterium-deuterium reactions will yield more energy
emfennelly

HowStuffWorks "Photovolatic Cells: Converting Photons to Electrons" - 0 views

science.howstuffworks.com/...solar-cell1.htm

APChem FinalProject Solar Photovoltaic

shared by emfennelly on 03 Jun 14 - No Cached
  • Photovoltaic cells are made of special materials called semiconductors such as silicon,
  • when light strikes the cell, a certain portion of it is absorbed within the semiconductor material. This means that the energy of the absorbed light is transferred to the semiconductor. The energy knocks electrons loose, allowing them to flow freely.
charlottecr

phthalates-infographic.png (480×420) - 0 views

saferchemicals.org/...phthalates-infographic.png

Phthalates

shared by charlottecr on 03 Jun 14 - No Cached
  • charlottecr on 03 Jun 14
     
    image
claireb27

Provide energy from fusion - Engineering Challenges - 0 views

www.engineeringchallenges.org/...9079.aspx

APchem

shared by claireb27 on 27 May 14 - No Cached
  • n theory, the lithium in that battery could supply your household electricity needs for 15 years.
  • Earthbound reactors cannot achieve the high pressures of the sun’s interior
  • But temperatures much higher than the sun’s can be created to compensate for the lesser pressure,
  • ...1 more annotation...
  • heavier forms of hydrogen, known as deuterium (with one proton and one neutron) and tritium (one proton plus two neutrons) are fused.
charlottecr

Tox Town - Phthalates - Toxic chemicals and environmental health risks where you live a... - 0 views

toxtown.nlm.nih.gov/...chemicals.php

Phthalates

shared by charlottecr on 30 May 14 - No Cached
  • The human health effects of phthalates are not yet fully known but are being studied by several government agencies, including the Food and Drug Administration, the National Institute of Environmental Health Sciences, and the National Toxicology Program's Center for the Evaluation of Risks to Human Reproduction. 
  • Di(2-ethylhexyl) phthalate is listed as "reasonably anticipated to be a human carcinogen" in the Twelfth Report on Carcinogens published by the National Toxicology Program. 
charlottecr

CDC - NBP - Factsheet - Pthalates - 0 views

www.cdc.gov/...phthalates_factsheet.html

Pthalates

shared by charlottecr on 30 May 14 - No Cached
  • hthalates are a group of chemicals used to make plastics more flexible and harder to break.
  • Once phthalates enter a person's body, they are converted into breakdown products (metabolites) that pass out quickly in urine.
claireb27

Sustainable nuclear fusion breakthrough raises hopes for ultimate green energy | Scienc... - 0 views

www.theguardian.com/...eakthrough-green-energy-source

APchem

shared by claireb27 on 27 May 14 - No Cached
  • generated more energy from fusion reactions than they put into the nuclear fuel,
  • The ultimate goal – to produce more energy than the whole experiment consumes – remains a long way off
  • with zero carbon emissions during operation and minimal waste
  • ...4 more annotations...
  • 92 powerful lasers to crush a minuscule amount of fuel so hard and fast that it becomes hotter than the sun.
  • The lasers are fired into a gold capsule that holds a 2mm-wide spherical pellet.
  • The fuel is coated on the inside of this plastic pellet in a layer as thin as a human hair.
  • When the laser light enters the gold capsule, it makes the walls of the gold container emit x-rays, which heat the pellet and make it implode with extraordinary ferocity. The fuel, a mixture of hydrogen isotopes called tritium and deuterium, partially fuses under the intense conditions.
  • claireb27 on 27 May 14
     
    article on recreating nuclear fusion and its future applications
charlottecr

Antimony (Sb) - Chemical properties, Health and Environmental effects - 0 views

www.lenntech.com/...sb.htm

Antimony

shared by charlottecr on 30 May 14 - No Cached
  • Antimony compounds are used to make flame-proofing materials, paints, ceramic enamels, glass and pottery
  • Human exposure to antimony can take place
  • by skin contact
  • ...1 more annotation...
  • As the exposure continues more serious health effects may occur, such as lung diseases, heart problems, diarrhea, severe vomiting and stomach ulcers.
claireb27

BBC - Future - Fusion: The quest to recreate the Sun's power on Earth - 0 views

www.bbc.com/...-the-quest-to-recreate-the-sun

shared by claireb27 on 27 May 14 - No Cached
  • It works by forcing together two types, or isotopes, of hydrogen
  • Provence in southern France
  • emand is expected to double by 2050, while the share coming from fossil fuels – currently 85%
  • ...13 more annotations...
  • engineers need to build the reactor to withstand temperatures at least ten times that of the Sun – which means hundreds of millions of degrees.
  • physicists have designed a doughnut-shaped reaction chamber, called a tokamak.
  • okamak deploys a powerful magnetic field to suspend and compress the hydrogen plasma
  • the fusion reaction is not self perpetuating.
  • he reaction far safer.
  • one of the hydrogen isotopes used, tritium, is radioactive
  • moderately seismically active
  • he site won't be ready for the first experiments until 2020.
  • deuterium (a hydrogen isotope abundant in sea water) and tritium (which will be made from lithium), won't take place until 2028.
  • The plan is to use 50 megawatts (in heating the plasma and cooling the reactor), and get 500 MW out.
  • 1997, achieved a 16 MW output with a 25 MW input.
  • If Iter is successful in its proof of principle mission, the first demonstration fusion plants will be built,
  • the technology remains unproven,
  • claireb27 on 27 May 14
     
    "The quest to recreate the Sun's power on Earth"
charlottecr

Toluene | Technology Transfer Network Air Toxics Web site | US EPA - 0 views

www.epa.gov/...toluene.html

shared by charlottecr on 30 May 14 - No Cached
  • he central nervous system (CNS) is the primary target organ for toluene toxicity in both humans and animals for acute (short-term) and chronic (long-term) exposures.
  • narcosis have been frequently observed in humans acutely exposed to low or moderate levels of toluene by inhalation;
  • Cardiac arrhythmia
  • ...2 more annotations...
  • Following the ingestion of toluene a person died from a severe depression of the CNS. Constriction and necrosis of myocardial fibers, swollen liver, congestion and hemorrhage of the lungs, and tubular kidney necrosis were also reported.
  • Physical Properties
franklind2015

HowStuffWorks "Nonstick Cookware History" - 0 views

home.howstuffworks.com/nonstick-cookware1.htm

shared by franklind2015 on 30 May 14 - No Cached
  • searching for a less toxic chemical to use as a new refrigerant.
    • franklind2015
      franklind2015 on 30 May 14
       
      Roy Plunkett tried to produce tetrafluoroethylene and instead produced polytetrafluoroethylene. It was a slippery substance. Patented in 1941. Trademarked by DuPont as Teflon in 1945.
franklind2015

Why do we use microwaves? - 0 views

www.physicsforums.com/showthread.php

shared by franklind2015 on 30 May 14 - No Cached
  • They do not fit through tight spaces and they do not have penetrating power.
  • More things are capable of absorbing microwaves
franklind2015

Science Week - What's the Chemistry of Cooking? - 0 views

www.scienceweek.ie/...chemistry-of-cooking.html

shared by franklind2015 on 30 May 14 - No Cached
  • casein
    • franklind2015
      franklind2015 on 30 May 14
       
      Found in milk and dairy products will affectively wash away capsaicin the chemical that makes things spicy.
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