Hidden Figures (book) – Wikipedia
December 7, 2019Modeling the within-host dynamics of HIV infection
December 7, 2019https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3765939/
BMC Biol. 2013; 11: 96.
Published online 2013 Sep 3. doi: 10.1186/1741-7007-11-96
PMCID: PMC3765939
PMID: 24020860
Modeling the within-host dynamics of HIV infection
Alan S Perelson1 and Ruy M Ribeiro1
Heat equation – Wikipedia
December 7, 2019https://en.wikipedia.org/wiki/Heat_equation
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Meaning of the equation
Informally, the Laplacian operator {\displaystyle \nabla ^{2}}\nabla ^{2} gives the difference between the average value of a function in the neighborhood of a point, and its value at that point. Thus, if {\displaystyle u}u is the temperature, {\displaystyle \nabla ^{2}u}{\displaystyle \nabla ^{2}u} tells whether (and by how much) the material surrounding each point is hotter or colder, on the average, than the material at that point.
By the second law of thermodynamics, heat will flow from hotter bodies to adjacent colder bodies, in proportion to the difference of temperature and of the thermal conductivity of the material between them. When heat flows into (or out of) a material, its temperature increases (respectively, decreases), in proportion to the amount of heat divided by the amount (mass) of material, with a proportionality factor called the specific heat capacity of the material.
Therefore, the equation says that the rate {\displaystyle {\dot {u}}}{\displaystyle {\dot {u}}} at which the material at a point will heat up (or cool down) is proportional to how much hotter (or cooler) the surrounding material is. The coefficient {\displaystyle \alpha }\alpha in the equation takes into account the thermal conductivity, the specific heat, and the density of the material.
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How Joseph Fourier discovered the greenhouse effect
December 7, 2019https://www.irishtimes.com/news/science/how-joseph-fourier-discovered-the-greenhouse-effect-1.3824189
liked warm temperatures too!
Fulfillment By Amazon (FBA) fulfillment services – Amazon.com
December 7, 2019Amazon expands Bezos’ elite ‘S-team,’ adding 6 execs from emerging branches of the company – GeekWire
December 7, 2019Amazon.com: Hasbro Gaming Rubik’s 3X3 Cube, Puzzle Game, Classic Colors: Toys & Games
December 6, 2019Archaeology – Buried metal artefacts gather stories on their surfaces | Science and technology | The Economist
December 6, 2019history from chemistry
