17, September 1988, retrieved 202/10/02, original source: https://www.nps.gov/tps/how-to-preserve/briefs/17-architectural-character.htm Excerpt: Every old building is unique, with its own identity and its own distinctive character. Character refers to all those visual aspects and physical ...
When you're designing a system to move fluids around – say, a natural gas extraction rig – it's essential to know how fast the fluid you're working with is flowing through the pipes. Superficial flow velocity (aka superficial liquid velocity or superficial gas velocity...
Wood is the least efficient fuel, but given its low cost, availability, and sustainability, that doesn't always bother people. Even though coal is one of the cheapest fuels, it's dirtiness and other environmental drawbacks have made it much less popular in recent decades. Natural gas owes ...
Using electrolysis, some of these devices split water into hydrogen and oxygen gas. Then, the former is combined with an undesirable compound: carbon dioxide (CO2). Humans naturally exhale this colorless gas, but breathing in too much of it is hazardous to your health. On Earth that usually ...
Natural gas, a much cleaner and more efficient fuel, has become an increasingly important source of power since the mid-20th-century. Yet all these fuels have their drawbacks. Coal is dirty and inefficient. Oil exists in limited supplies in places such as the Middle East and growing demand ...
(10) energy4me. Petroleum – Oil and Natural Gas. Retrieved from: http://energy4me.org/all-about-energy/what-is-energy/energy-sources/petroleum/ (11) ThermoFisher SCIENTIFIC. Ubiquitous Industrial Minerals: Nature’s Most Popular Raw Materials. ...
Although group work is increasingly used in STEM courses and may lead to improved academic outcomes, there is evidence that some implementations of group work may lead to unintended barriers for certain students’ learning. Despite the growing number of neurodivergent undergraduate students, there is ...
Retrieved from CDC: http://www.cdc.gov/nchs/fastats/asthma.htm Freid VM, Makuc DM, Rooks RN (1998) Ambulatory health care visits by children: principal diagnosis and place of visit. Vital health stat 137:1–23 Galgiani JN (2012) Recent dust storms and the ...
Gas chromatography is a largely automated type of chemical analysis you can do with a sophisticated piece of laboratory equipment called, not surprisingly, a gas chromatograph machine.First, a tiny sample of the mixture of substances being studied is placed in a syringe and injected into the ...
The natural resource base, on which the quality-of-life of our societies is built, is in danger of overexploitation and collapse. Due to growth of world population and continued high levels of consumption in the developed world, combined with the rapid industrialisation of countries such as ...