منابع مشابه
A tale of two Germanys
Editor—The fall of the Berlin Wall in 1989 marked the beginning of the end of communism in eastern Europe and in eastern Germany. As McKee and Fister point out, certain constellations of epidemiological and demographic variables characterise the resultant process of political and economic transition: low or even decreasing life expectancy (especially for men) and higher prevalences of alcoholis...
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Figure 6 illustrates the simplified RBE model (equation 3) used in this work. Figure 6a shows 9 the physical dose di for 10 9 protons for a single pencil beam, delivering approximately 4.5 10 Gy at the Bragg peak, which is located at the distal edge of the target volume. Figure 6b 11 shows the additional biological dose c L̄idi in Gy for c = 0.04 μm/keV. The sum of c L̄idi and 12 di yields the RB...
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Propositional plans of all forms often display a certain level of concurrency which can be exploited by scheduling the plan. This reveals the earliest times at which each action can be applied whilst still achieving the goal and shortening the plan duration. However, the output of this scheduling process is simply a set of timestamped actions, losing implicit information present in the original...
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As the leader of the largest economy, President of the United States has substantive influence on addressing climate change problems. However, a presidential election is often dominated by issues other than energy problems. This paper focuses on the 2016 presidential election, and examines the energy plans proposed by the leading Democrat and Republican candidates. Our data from the Iowa caucus...
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ژورنال
عنوان ژورنال: Nature
سال: 1978
ISSN: 0028-0836,1476-4687
DOI: 10.1038/271603a0