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On November 11, 2019, observers will be able to see a rare sight: a transit of Mercury across the face of the Sun. Mercury transits are visible only about 13 times per century. Todd Timberlake, co-author of Finding our Place in the Solar System discusses the history of this rare sight.
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The book accumulates more than a 40-year experience of the authors’ research in the field of chemical non-equilibrium effects in combustion and reactive flows and includes our theoretical developments and tools which have a number of novel features that include but are not limited to the following: Chemical kinetics equations in exponential form. They provide […]
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The development of a fast and accurate method for computing the properties of the helix slow-wave structures used in travelling-wave tubes (TWTs) is described. The calculation uses a sheath helix model in which the shunt capacitance and series inductance are adjusted by constants whose values depend only on the dimensions of the structure. The constant for the capacitance is calculated using a 2D finite difference solution of Laplace’s equation. The constant for the inductance can be inferred from the phase velocity when the phase difference per turn is 180 degrees.
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Understanding turbulence is an important and challenging problem with a million dollar prize money on it. We illustrate the complexity of a turbulent flow using an example. Consider coffee being mixed vigorously, say by stirring (Figure 1(a)). The kinetic energy fed at the large-scales cascades to intermediate scales and then to small scales, as shown […]
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In the era of Internet of Things (IoT), billions of smart devices, household appliances, smart phones, sensors, vehicles are connected by radio frequency signals. With the ubiquitous deployment of wireless radio devices, it will be possible to measure and track virtually everything everywhere. In fact, here when one refers to “wireless,” it is no longer […]
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In this video Les Kirkup, author of Experimental Methods for Science and Engineering Students explains the need for students to develop a range of techniques and methods in their journey to becoming successful scientists and engineers .
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One of the reasons people like science and engineering is because of the joy of discovering things about the world around us. The more scientifically inclined are curious about nature and what surrounds us, and often wonder why things are the way they are. People that are more oriented towards engineering often ask how one […]
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In this memorable photograph (courtesy of NASA), we see astronaut Buzz Aldrin holding in his right hand a sophisticated mirror: the Laser Ranging Retro-Reflector (LR3). This mirror has now been standing on the Moon for 50 years. By sending a laser beam from the Earth to the mirror, and measuring the time it takes […]
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