The gravitational waves from a binary black hole with masses \ can be detected with the Laser Interferometer Space Antenna once their orbital frequency exceeds 10\–10\ Hz. The binary separation at this stage is \R_{\mathrm{g}}\), and the orbital speed is \\). I argue that at this stage, the binary will be producing bright electromagnetic radiation via gas bound to the individual BHs. Both BHs will have their own photospheres in X-ray and possibly also in optical bands. Relativistic Doppler modulations and (...) lensing effects will inevitably imprint periodic variability in the EM light-curve, tracking the phase of the orbital motion, and serving as a template for the GW inspiral waveform. Advanced localization of the source by LISA weeks to months prior to merger will enable a measurement of this EM chirp by wide-field X-ray or optical instruments. A comparison of the phases of the GW and EM chirp signals will help break degeneracies between system parameters, and probe a fractional difference difference \ in the propagation speed of photons and gravitons as low as \. (shrink)

Werner Schuster was a doctor long before he became an artist--but it was a childhood fascination with photography that drove him to study radiology in the first place, so it's only fitting that he should now be one of the most versatile and interesting artists working with x-ray photography today. This volume presents full-color reproductions of Schuster's photographs along with those of other photographers, from the pioneering x-ray creators of 1895 to present-day artists working in the medium. An essay by (...) René Harather tells the history of x-ray photography and highlights the most important developments and proponents of the genre since its discovery. The second part of the book turns to Schuster's work, showing how he has expanded the boundaries of the medium and made creative use of the interplay between traditional and x-ray photography. A fascinating look at a stunning marriage of art and science, X-Ray is the first comprehensive representation of the history of x-ray photography. (shrink)

During the first half of the twentieth century, the mining industry in Britain was subject to recurrent disputes about the risk to miners’ lungs from coal dust, moderated by governmental, industrial, medical and mining bodies. In this environment, precise measurements offered a way to present uncontested objective knowledge. By accessing primary source material from the National Archives, the South Wales Miners Library and the University of Bristol's Special Collections, I demonstrate the importance that the British Medical Research Council (MRC) attached (...) to standardized instrumental measures as proof of objectivity, and explore the conflict between objective and subjective measures of health. Examination of the MRC's use of spirometry in their investigation of pneumoconiosis (miner's lung) from 1936 to 1945 will shed light on this conflict and illuminate the politics inherent in attempts to quantify disability and categorize standards of health. (shrink)

Historians have found it difficult to give a general account of the early medical use of X‐rays in medicine. While the rays were hailed by some as a miracle technology, their early medical application was patchy, often remaining subsidiary to traditional methods of diagnosis and treatment, and was of disputed value. In this essay, I argue that the selective appropriation of the new technology needs to be understood within the wider medical practice of the period. The argument is developed around (...) the case of orthopedic surgery in Germany, probably the first example in which doctors quickly made X‐rays indispensable as a medical tool. I show that value of X‐rays in this case was contingent upon an ongoing dispute, the theory and practice of surgical intervention, and the sociology of new surgical knowledge. (shrink)

The composition of nitrogen-doped hydrogenated amorphous carbon films grown in a magnetically confined rf plasma-enhanced chemical vapour deposition system has been determined by X-ray photoelectron spectroscopy and compared with that determined using a combination of elastic recoil detection analysis, Rutherford back-scattering and nuclear reaction analysis. The importance of nitrogen doping or 'incorporation' in hydrogenated amorphous carbon films is discussed in relation to the significant variation in the sp 2 -to-sp 3 ratio that takes place. At 7 at.% N in the (...) a-C : H matrix, a critical change in the microstructure is observed, which governs the resulting mechanical, optical and electronic properties. Finally, the correlation between the sp 2 and sp 3 fractions determined by a non-destructive method of obtaining the bond fractions and by electron-energy-loss spectroscopy is discussed, with a view to evaluating accurately the sp 2 fraction in a-C : H : N films. (shrink)

The author, who shared the 1959 Nobel Prize in Physics with Owen Chamberlain, offers impressions and recollections of the development of modern physics. Rather than a chronological approach, Segre emphasizes interesting, complex personalities who often appear only in footnotes. Readers will find that this book adds considerably to their understanding of science and includes compelling topics of current interest.

An attempt is made to establish the historical context in which the structure and function of haemoglobin were investigated by X-ray crystallographers in the 1940s and 50s. It is concluded that until the 1960s the interpretations of the data of crystallographic investigations were dependent upon the results of applying traditional techniques of physical and organic chemistry. In the case of haemoglobin, no less than in those of smaller organic molecules, crystallographic studies in the 1940s and early 50s served to validate, (...) and metricize conclusions already suggested or adopted on other grounds, but the subsequent tracing of the actual conformation of the polypeptide chains in the globin portion of the molecule was a unique achievement of the X-ray crystallographers and marked the beginning of the independent establishment of structures by this profession. The impact of this achievement upon the structure-function relationships of haemoglobin is discussed briefly. (shrink)

We present the idea of searching for X-rays as a signature of the mechanism inducing the spontaneous collapse of the wave function. Such a signal is predicted by the continuous spontaneous localization theories, which are solving the “measurement problem” by modifying the Schrödinger equation. We will show some encouraging preliminary results and discuss future plans and strategy.

A 10 kHz pulsed X-ray generator utilising a hot-cathode triode in conjunction with a new type of grid control device for controlling X-ray duration is described. The energy-storage condenser was charged up to 70 kV by a power supply, and the electric charges in the condenser were discharged to the X-ray tube repetitively by the grid control device. The maximum values of the grid voltage, the tube voltage, and the tube current were −1.5 kV, 70 kV, and 0.4 A, respectively. (...) The duration of the flash X-ray pulse was primarily determined by the time constant of the grid control device and the cut-off voltage of thermoelectrons. The X-ray duration was controlled within a region of less than 1 ms; the X-ray intensity with a pulse width of 0.27 ms, a charged voltage of 70 kV, and a peak tube current of 0.4 A was 0.92 μC kg −1 at 0.5 m per pulse. The maximum repetition rate was about 10 kHz, and the size of the focal spot was about 3.5×3.5 mm. (shrink)