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Richard G. Carter
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 […]
Read More
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Richard CJ Somerville, Samuel S P Shen
In recent decades, a typical undergraduate university student enrolled in an atmospheric, oceanographic, or climate science major might take about six mathematics and computing courses. This mathematics curriculum has several shortcomings. One is that much of the mathematics that is taught has little relevance to a major such as climate science. Another is that the […]
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Linda Levy Peck
I decided to write Women of Fortune when I discovered that Grace Bennet, widow of a rich mortgage and loan banker and mother of the Countess of Salisbury, had been murdered by the local butcher in 1694. Called by a contemporary “the most sordid person who ever lived,” Grace was, however, not only a victim […]
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Luke Nottage, Jeannie Paterson, Justin Malbon, Caron Beaton-Wells
The ten states now comprising the Association of Southeast Asian Nations have collectively become a major part of the world economy, bringing together over 600 million people including a growing middle class. Yet they are highly diverse in socio-economic development, political structure and legal traditions, as outlined in chapter 1 of our book. What hope […]
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Jane Kingsley-Smith
Lovers swoon at Shakespeare’s Sonnets – or so we’re told. That’s why lists proliferate of ‘Shakespeare’s Most Romantic Sonnets’, and why Valentine’s Day produces so many novelty pink-and-red volumes. But historically, the Sonnets have inspired a far more complicated set of emotions than love or desire, including frustration, contempt, and resentment, and their authenticity has […]
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Christopher B. Hays
The author looks over the ruins of Ramat Rahel near Jerusalem. He argues it was the site of an ancient Assyrian imperial citadel whose destruction was celebrated in Isaiah 24-27
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Professor Emma Smith
Shakespeare and War – the topic for Shakespeare Survey 72 – is nothing if not wide-ranging. From the significance of Tom Hiddleston’s unfeasibly tight armour in Thea Sharrock’s 2012 film of Henry V (thanks to Ramona Wray), to the deadly technological excesses of gunpowder development (Randall Martin), and the relations between Coriolanus and Homeland (Christina […]
Read More
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Richard G. Carter
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.
Read More
-
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 […]
Read More
-
Richard CJ Somerville, Samuel S P Shen
In recent decades, a typical undergraduate university student enrolled in an atmospheric, oceanographic, or climate science major might take about six mathematics and computing courses. This mathematics curriculum has several shortcomings. One is that much of the mathematics that is taught has little relevance to a major such as climate science. Another is that the […]
Read More
-
Linda Levy Peck
I decided to write Women of Fortune when I discovered that Grace Bennet, widow of a rich mortgage and loan banker and mother of the Countess of Salisbury, had been murdered by the local butcher in 1694. Called by a contemporary “the most sordid person who ever lived,” Grace was, however, not only a victim […]
Read More
-
Luke Nottage, Jeannie Paterson, Justin Malbon, Caron Beaton-Wells
The ten states now comprising the Association of Southeast Asian Nations have collectively become a major part of the world economy, bringing together over 600 million people including a growing middle class. Yet they are highly diverse in socio-economic development, political structure and legal traditions, as outlined in chapter 1 of our book. What hope […]
Read More
-
Jane Kingsley-Smith
Lovers swoon at Shakespeare’s Sonnets – or so we’re told. That’s why lists proliferate of ‘Shakespeare’s Most Romantic Sonnets’, and why Valentine’s Day produces so many novelty pink-and-red volumes. But historically, the Sonnets have inspired a far more complicated set of emotions than love or desire, including frustration, contempt, and resentment, and their authenticity has […]
Read More
-
Christopher B. Hays
The author looks over the ruins of Ramat Rahel near Jerusalem. He argues it was the site of an ancie...
Read More
-
Professor Emma Smith
Shakespeare and War – the topic for Shakespeare Survey 72 – is nothing if not wide-ranging. From the significance of Tom Hiddleston’s unfeasibly tight armour in Thea Sharrock’s 2012 film of Henry V (thanks to Ramona Wray), to the deadly technological excesses of gunpowder development (Randall Martin), and the relations between Coriolanus and Homeland (Christina […]
Read More
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