1,458 research outputs found
'If I should die tonight' poem
No full textHumorous poem copied by Harrison Kerr and written by Benjamin Franklin King ca. 1890. The poem, titled "If I should die tonight," jokes about money owed to the author and the shock he would experience at being repaid upon his death. It was written as a parody of a serious contemporary poem of the same title.
Harrison Henry Kerr (1839-1901), born in North Georgetown, Ohio, served along with his brother, Ezra, as a private in Company D of the 58th Ohio Volunteer Infantry. He was taken prisoner at the Battle of Chickasaw Bayou, Mississippi, on December 29, 1862., and held for three months before being exchanged and returning to his regiment. He was discharged on January 14, 1865. Following the war, he was married to Elizabeth (Rettig) Kerr. The two lived in Cleveland and had one son, Harrison McKinley Kerr. In 1888, he joined the Memorial Post No. 141, Grand Army of the Republic. He is buried in North Georgetown Cemetery
A Future Vision For The Engineering Design Environment: A Future Sociotechnical Scenario
No full textThis paper presents a future vision for the working practices of designers within a manufacturing organisation. By its very nature the engineering design environment is highly distributed in nature and is characterised by a large number of information sources, which together with the designers forms a complex sociotechnical system. In discussions with designers it is apparent that changes are required to this environment to reflect the changes in the design process and organisations. We have developed a scenario that incorporates many of the features requested by designers and managers to improve the design environment. The scenario sets out a route map for the development of technical and social tools that aid the designer
Experimental validation of nonlinear Fourier transform-based Kerr-nonlinearity identification over a 1600km SSMF link
No full textRecently, a nonlinear Fourier transform-based Kerr-nonlinearity identification algorithm was demonstrated for a 1000 km NZDSF link with accuracy of 75%. Here, we demonstrate an accuracy of 99% over 1600 km SSMF. Reasons for improved accuracy are discussed.Accepted Author ManuscriptTeam Sander Wahl
International Harmonization and the Gains from Trade
No full textInternational harmonization of standards and regulations is often a goal expressed in trade agreements because it is expected to yield gains from trade. Absence of progress toward harmonization is often interpreted as being motivated by protectionism, with differences in standards and regulations seen as non-tariff barriers. While protectionism may well be the source of resistance to harmonization, there may be other reasons it is not pursued. These alternative explanations have not received much attention from economists. In this article some of these alternatives are outlined - demand effects from altering standards, switching costs, proprietary technologies. The article concludes that proposals for international harmonization need to be scrutinized carefully.demand effects, harmonization, regulation, standards, switching costs, TBT, International Relations/Trade,
Magnetised Kerr/CFT correspondence
No full textAbstractThe tools of Kerr/CFT correspondence are applied to the Kerr black hole embedded in an axial external magnetic field. Its extremal near horizon geometry remains a warped and twisted product of AdS2×S2. The central charge of the Virasoro algebra, generating the asymptotic symmetries of the near horizon geometry, is found. It is used to reproduce, via the Cardy formula, the Bekenstein–Hawking entropy of the magnetised Kerr black hole as the statistical microscopic entropy of a dual CFT. The presence of the background magnetic field makes available also a second dual CFT picture, based on the U(1) electromagnetic symmetry, instead of the only rotational one of the standard non-magnetised Kerr spacetime.A Meissner-like effect, where at extremality the external magnetic field is expelled out of the black hole, allows us to infer the value of the mass for these magnetised extremal black holes.The generalisation to the CFT dual for the magnetised extreme Kerr–Newman black hole is also presented
Does the spirit of Charles Dickens live on in his furniture?
No full textA table owned by the author has been export stopped in the UK – a situation that Dickens himself would have relishe
Recession, International Trade and the Fallacies of Composition
No full textA truly global recession has not been manifest since the Great Depression of the 1930s. As a result, the multilateral institutions put in place at the end of the Second World War to ensure that a major depression never happened again have not been tested. One of the lessons of the Great Depression was that governments had a major role to play in managing the economy. The use of subsidies to affect economic outcomes was one manifestation of this expanded role. In a recession, sector specific subsidies will likely be requested by firms. Subsidies can distort trade, leading to the potential for beggar thy neighbour subsidy wars. Subsidies will be difficult to discipline in a global recession.beggar thy neighbour, deficits, paradox of thrift, recession, subsidies, International Relations/Trade,
Imaging a Kerr Black Hole
No full textThe observations of the Event Horizon Telescope led to the first mages of a black hole, an object with so much gravity that not even light can escape it. These images remain fuzzy but clearly show the shadow of a black hole with a bright disk and will only improve in quality over time. We want to be able to deduce, from the images, the following properties of the observed black hole; the mass, the angular momentum and the orientation of the black hole. This can be done by visualising the mathematical model of a black hole. This model is a result of the theory of general relativity and comparing the theoretical model to the real-life observations could be used to validate this theory. We have visualized a Kerr black hole. This is a black hole that is more realistic than the original Schwarzschild black hole because it also includes the angular momentum of the black hole. The Kerr solution describes the curvature of space-time around a rotating black hole. This curvature of spacetime causes light rays to travel in a curved path instead of a straight line. The distortion of light rays causes distortions in the image of a black hole in a similar way that a lens of a camera causes distortion in an image by curving light. By using the mathematical field of differential geometry we can exactly describe the curved path of a light ray around a Kerr black hole. This path of the light ray can be formulated in different coordinate systems. We will use the so-called Kerr-Schild coordinate system because it does not have the coordinate-related singularities of other coordinate systems. To create the visualisation of a Kerr black hole we will implement a ray-tracing algorithm. This is an algorithm that can create a 2D projection of a 3D space. The algorithm normally uses straight light rays to create an image, we will however adapt this program to model the curved light rays around a Kerr black hole. The visualisation employs a celestial sphere around the black hole to project the universe around it. Furthermore, an accretion disk around the black hole is added to model light-emitting particles orbiting the black hole. Our ray-tracing algorithm makes it possible to realistically visualise a Kerr black hole with varying parameters. These parameters are the mass of the black hole, the angular momentum, orientation compared to the observer and the size and structure of the accretion disk. To exemplify the ability of the ray-tracing model to fit these parameters, different angular momentum and orientation values are compared to the properties of the resulting image. This means that when in the future we get higher resolution observations of a black hole, the properties of this black hole can be deduced from the ray-tracing model. This can help our understanding of the curvature of space-time caused by general relativity and our understanding of the universe as a whole.Applied Mathematic
Kerr–Newman black holes with scalar hair
No full textAbstractWe construct electrically charged Kerr black holes (BHs) with scalar hair. Firstly, we take an uncharged scalar field, interacting with the electromagnetic field only indirectly, via the background metric. The corresponding family of solutions, dubbed Kerr–Newman BHs with ungauged scalar hair, reduces to (a sub-family of) Kerr–Newman BHs in the limit of vanishing scalar hair and to uncharged rotating boson stars in the limit of vanishing horizon. It adds one extra parameter to the uncharged solutions: the total electric charge. This leading electromagnetic multipole moment is unaffected by the scalar hair and can be computed by using Gauss's law on any closed 2-surface surrounding (a spatial section of) the event horizon. By contrast, the first sub-leading electromagnetic multipole – the magnetic dipole moment –, gets suppressed by the scalar hair, such that the gyromagnetic ratio is always smaller than the Kerr–Newman value (g=2). Secondly, we consider a gauged scalar field and obtain a family of Kerr–Newman BHs with gauged scalar hair. The electrically charged scalar field now stores a part of the total electric charge, which can only be computed by applying Gauss' law at spatial infinity and introduces a new solitonic limit – electrically charged rotating boson stars. In both cases, we analyze some physical properties of the solutions
Henri Temianka Correspondence; (kerr)
No full textThis collection contains material pertaining to the life, career, and activities of Henri Temianka, violin virtuoso, conductor, music teacher, and author. Materials include correspondence, concert programs and flyers, music scores, photographs, and books.https://digitalcommons.chapman.edu/temianka_correspondence/4034/thumbnail.jp
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