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Energy Efficient Homes May Be Linked To Increased Asthma

Energy Efficient Homes May Be Linked To Increased Asthma Risk

Provided by Alex Smalley, University of Exeter The drive for energy efficient homes could increase asthma risks, according to new research. Led by a team at the University of Exeter Medical School, the research has found that a failure by...

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Latest Construction Reference Libraries

Eastern Mole, Scalopus aquaticus
2012-05-04 05:50:15

The eastern mole (Scalopus aquaticus) is also known as the common mole, and it is the only mole in its genus. This mole has a very wide range, the largest of any native North American mole ranging from Canada to the eastern areas of the United States, and as far south as Mexico. In the United Sates, this mole can be found in Texas, Nebraska, Kansas, Florida, Louisiana, South Dakota, and Wisconsin. However, it is not found in the Appalachian Mountains. Its Canadian range is limited to the...

0_5a98699c7988fb7168891532bcdea90b
2010-10-04 16:15:56

Staplers, used widely in government, business, offices, and schools, are mechanical devices that join sheets of paper by driving a metal staple through the paper. The first stapler was created for King Louis XV. Each staple was inscribed with the insignia of royal court. George McGill created the predecessor of the modern staple. In 1867, he received a patent for a press to insert his fastener into paper. Henry R. Heyl received a patent for the first machine to both insert and clinch the...

28_1edea1726841016f6cad5f55677d5af7
2005-05-26 10:48:13

Gypsum is a very soft mineral composed of calcium sulfate dihydrate, with the chemical formula CaSO4·2H2O. Chemical structure Heating gypsum above approximately 150°C (302°F) partially dehydrates the mineral by driving off exactly 75% of the water contained in its chemical structure. CaSO4·2H2O + heat → CaSO4·½H2O + 1½H2O (steam) The partially dehydrated mineral is called calcium sulfate hemihydrate or calcined gypsum (commonly known as plaster of...

28_38a74dbdd786cb21764ba2c91f3472d2
2005-05-25 19:16:15

Perlite is an amorphous glass mineral of volcanic origin. Typical analysis: 70-75% SiO2, 12-15% Al2O3, Na2O 3-4%, K2O 3-5%, Fe2O3 0,5-2%, MgO 0,2-0,7%, CaO 0,5-1,5% Loss On Ignition 3-5% Properties: When it reaches temperatures of 850"“900 °C, perlite softens (since it is a glass) and water trapped in the structure escapes and this causes the expansion of the material to 7"“15 times its original volume. The expanded material is a brilliant white, due to the reflectivity of the...

28_9e99e6b7cd830807cc14a464546eaf52
2005-05-25 10:53:46

Vermiculite is a natural mineral which expands with the application of heat. It is formed by hydration of certain basaltic minerals, and is often found in association with asbestos. Mining operations in Libby, Montana were closed in 1990 in response to asbestos contamination. Expanded vermiculite is used as a soil conditioner, as loose-fill insulating and packing material, as an insulating filler for plaster and concrete compounds, and as a carrier for dry handling and slow release of...

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Word of the Day
tourtiere
  • a meat pie that is usually eaten at Christmas in Quebec
The word 'tourtiere' comes from the French tourte, or passenger pigeon.
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