GC: n CT: Ionic substances contain charged particles called ions. For example, lead bromide contains positively charged lead ions and negatively charged bromide ions. Electrolysis is the process by which ionic substances are decomposed (broken down) into simpler substances when an electric current is passed through them. For electrolysis to

CG: n CT: Besides natural sources, the electromagnetic spectrum also includes fields generated by human-made sources: X-rays are employed to diagnose a broken limb after a sport accident. The electricity that comes out of every power socket has associated low frequency electromagnetic fields. And various kinds of higher frequency radiowaves

GC: n CT: Electricity can be static, like the energy that can make your hair stand on end. Magnetism can also be static, as it is in a refrigerator magnet. A changing magnetic field will induce a changing electric field and vice-versa (the two are linked). These changing fields form

GC: n CT: According to the theory quantum mechanics, an electron bound to an atom can not have any value of energy, rather it can only occupy certain states which correspond to certain energy levels. The formula defining the energy levels of a Hydrogen atom are given by the equation:

GC: n CT: Storage tanks are an important part of any distribution system. Water can be pumped into the tank during periods of low demand and then pumped out of the tank into the distribution system during periods of peak demand. In addition, storage tanks can provide the water pressure

GC: n CT: The story of Joseph Weizenbaum is in many ways almost as interesting as that of Turing. An early pioneer in computer science, Weizenbaum was one of the fortunate few to join the embryonic MIT Artificial Intelligence Lab in the early 1960s. His most celebrated accomplishment was the

GC: n CT: Any U.S. climate policy will have to be designed both to protect the earth’s climate by reducing emissions, and to protect American households from undue economic losses. Our model shows that these two objectives can almost be separated from each other. Roughly speaking, emission reduction depends on

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CG: n CT: Although encrypted data appears random, encryption proceeds in a logical, predictable way, allowing a party that receives the encrypted data and possesses the right key to decrypt the data, turning it back into plaintext. Truly secure encryption will use keys complex enough that a third party is highly

GC: adj CT: The vast majority of the precipitation falling onto the land surface will eventually find its way back to the oceans via rivers, lakes or wetlands, or else be evaporated or transpired back into the atmosphere. There is one class of water-bodies, however, for which this journey is

GC: n CT: Physicists, who are scientists who study force, motion and energy, say that energy is the ability to do work, and work is moving something against a force, like gravity. There are a lot of different kinds of energy in the universe, and that energy can do different

GC: n CT: An energy balance usually refers to a year, and can be made for consecutive years to show time variations. Energy balances can be aggregate, or very detailed, depending on their functions. They can also be elaborate, showing all sorts of structural relationships between energy production and consumption,

GC: n CT: The population problem isn’t just a matter of the number of people. People consume food, fresh water, wood, minerals, and energy as we go about our daily lives. And producing food, pumping groundwater, harvesting wood, mining minerals, and burning fuel all deplete our resource base and produce

GC: n CT: Energy crops are grown specifically for use as fuel and offer high output per hectare with low inputs. Research into which strains perform best under UK conditions and typical outputs expected for different UK sites has been performed on a number of potential energy crops. S: BEC

GC: n CT: Energy density and the cost, weight, and size of onboard energy storage are important characteristics of fuels for transportation. Fuels that require large, heavy or expensive storage can reduce the space available to convey people and freight, weigh down a vehicle (making it operate less efficiently), or

GC: n CT: Over recent years, EU economies have been exposed to energy price increases leading to adverse effects on consumers and industries. Some economies have also been confronted with disruptions to gas supply, affecting gas-dependent industrial activities and households. Arguably, the EU economy will continue to be exposed to

GC: n CT: Energy efficiency is “using less energy to provide the same service”. There are other definitions, but this is a good operational one. The best way to understand this idea is through examples: When you replace a single pane window in your house with an energy-efficient one, the

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GC: n CT: To meet its energy needs, each country uses the energy available to it in differing proportions. This is what we call the energy mix. Since the 19th century, the energy sources used to meet global demand have been mostly fossil fuels (coal, oil and natural gas). These

GC: n CT: The energy pile, also called heat exchanger pile, is a pile equipped with individual or several pipe circuits in order to enable exchange of heat with the surrounding soil. The function of energy piles is dual. The first function consists of transferring load from a construction into

GC: n CT: The rising cost of the energy bill brings additional pressure to household budgets’. As a result, some European households are spending a higher share of their budget on domestic energy services. Bearing the rising cost of the energy bill is particularly hard for low-income households, who may,

GC: n CT: At present there are four important energy resources: petroleum, coal, natural gas, and uranium-235. In the future oil shale and uranium-238 will probably join this list. On the demand side, the model specifies five demand categories: electricity, industrial heat, residential heat, and two transport categories. S: Brook

GC: n CT: This analysis reviews and synthesizes the literature on the net energy return for electric power generation by wind turbines. Energy return on investment (EROI) is the ratio of energy delivered to energy costs. We examine 119 wind turbines from 50 different analyses, ranging in publication date from