The Canadian Light Source — History and scientific prospects

2004 ◽  
Vol 82 (6) ◽  
pp. 1028-1042 ◽  
Author(s):  
G M Bancroft
Keyword(s):  
Light Source ◽  
X Rays ◽  
X Ray ◽  
The Third ◽  
Scientific Disciplines ◽  
The World ◽  
History Of ◽  
Synchrotron Light ◽  
Under Construction ◽  
The University

The Canadian Light Source (CLS) in Saskatoon has been under construction for the last 4 years, and will be producing a number of very intense beams of far-IR, IR, soft and hard X-rays in 2004 for use by several hundred Canadian scientists in chemistry, surface and material science, and a host of other scientific disciplines. The CLS will dramatically enhance the Canadian spectroscopic tradition that Gerhard Herzberg help create. I begin this article (from my 2002 CIC Montreal Medal lecture) with an overview of the history of SR in Canada, beginning in 1972 with the first Canadian synchrotron workshop organized at the University of Western Ontario by Bill McGowan, and attended by Dr. Herzberg. The CLS facility is then described, along with the properties of the first and second set of beamlines to be built at the CLS. These SR beams, in the IR and X-ray regions from the third generation CSL ring, will be competitive in brightness and intensity with the best beamlines in the world for most applications. Finally, some of the present Canadian SR research at foreign SR sources is described across the entire SR spectrum. All known spectroscopic and diffraction experiments are dramatically enhanced with SR; and SR opens up new areas of spectroscopy, microscopy, and spectromicroscopy that cannot be studied with any other source of radiation.Key words: synchrotron light, X-rays, infrared, spectroscopy.

LASER PULSE CIRCULATION SYSTEM FOR COMPACT MONOCHROMATIC TUNABLE HARD X-RAY SOURCE

2007 ◽  
Vol 22 (23) ◽  
pp. 4324-4332
Author(s):  
HARUYUKI OGINO ◽  
MENG DE ◽  
TOMOHIKO YAMAMOTO ◽  
FUMITO SAKAMOTO ◽  
KATSUHIRO DOBASHI ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Circulation System ◽  
X Rays ◽  
Electron Linear Accelerator ◽  
Yag Laser ◽  
X Ray ◽  
X Band ◽  
Rf Pulse ◽  
Under Construction ◽  
The University

We are construcing a laser electron Compton scattering monochromatic tunable hard X-ray source. It consists of the X-band (11.424 GHz) electron linear accelerator and Q-switch Nd : YAG laser. This work is a part of the JST (Japan Science and Technology Agency) project. The whole system is a part of the national project on the advanced compact medical accelerator development, hosted by NIRS (National Institute for Radiological Science). The University of Tokyo and KEK are working for the X-ray source. Main advantage of this X-ray source is monochromatic tunable hard X-rays (10-50keV) with the intensities of 108-109 photons/s. The table-top size X-ray source can generate dual energy monochromatic hard X-ray by turns and it takes about 40ms to chage the X-ray energy. It is calculated that the X-ray intensity is 107 photons/RF-pulse (108 photons/s in 10 pps) by the 35MeV electron and YAG laser (2J/pulse). The X-band beam line for the demonstration is under construction. We designed a laser pulse circulation system to increase the X-ray yield 10 times higer (up to 108 photons/RF-pulse, 109 photons/s). It can be proved that the laser total energy increases 10 times higher by the principle experiment with the lower energy laser (25mJ/pulse).

scholarly journals Nikola Tesla and medicine: 160th anniversary of the birth of the genius who gave light to the world - part I

2016 ◽  
Vol 69 (9-10) ◽  
pp. 313-322
Author(s):  
Danijela Vucevic ◽  
Drago Djordjevic ◽  
Tatjana Radosavljevic
Keyword(s):  
High Frequency ◽  
X Rays ◽  
X Ray ◽  
Nikola Tesla ◽  
Wide Range ◽  
The World ◽  
Biologic Effects ◽  
History Of ◽  
The Impact ◽  
Harmful Effects

Introduction. The interest in Nikola Tesla, a scientist, physicist, engineer and inventor, is constantly growing. In the millennia-long history of human civilization, it is almost impossible to find another person whose life and work has been under so much scrutiny of such a wide range of researchers, medical professionals included. Although Tesla was not primarily dedicated to biomedical research, his work significantly contributed to the development of radiology, and high frequency electrotherapy. This paper deals with the impact of Tesla?s work on the development of a new medical branch - radiology. Nikola Tesla and the Discovery of X-ray radiation. Tesla pioneered the use of X-rays for medical purposes, practically laying the foundations of radiology. Namely, since 1887, Tesla periodically experimented with X-rays, at that time still unknown and unnamed, which he called "shadowgraphs". Moreover, at the end of 1894, he conducted extensive research focusing on X-rays, but unfortunately it was interrupted after the fire burning down his laboratory in 1895. In 1896 and 1897, Tesla published ten papers on the biologic effects of X-ray radiation. All his studies on X-rays were experimental. During 1896 and 1897, Tesla continued improving X-ray devices. Apart from this, Tesla was the first to point out the harmful effects of exposure to X-ray radiation on human body. Conclusion. Nikola Tesla was a visionary genius of the future. Tesla?s pioneer steps, made more than a century ago in the domain of radiology, are still being used today.

scholarly journals Il Museo di Storia Naturale dell'Università degli Studi di Firenze. Le collezioni mineralogiche e litologiche | The Museum of Natural History of the University of Florence.The Mineralogical and Lithological Collections

2012 ◽  
Keyword(s):  
Natural History ◽  
The Third ◽  
The World ◽  
Fourth Volume ◽  
History Of ◽  
History Of The University ◽  
Set Up ◽  
University Of Florence ◽  
The University ◽  
Rock Specimens

The Museum of Natural History of the University of Florence, founded in 1775 by Grand Duke Pietro Leopoldo d'Asburgo Lorena, is one of the oldest and most prestigious scientific museums in the world. The fourth volume on the Collections of the Mineralogy and Lithology Section, published like the previous volumes by the Firenze University Press, fits perfectly in the series dedicated to the collections of the University's Museum System. The first part of the book describes in great detail the paths that led to the formation of the collections, starting with those dating to the Medici period and arriving at the specimens collected during recent expeditions. The second part illustrates and documents the extraordinary specimens of minerals, hardstone carvings and meteorites which represent the material patrimony of this section. Particular attention is given to the holotypes, the Elban Collection and the minerals of pegmatites, as well as the methods and solutions adopted to realize the project of the new museum exhibition set-up. The third and last part describes the studies carried out on the materials: from the minerals of the systematic collections to the rock specimens that recount not only the geodiversity of a region but also the history of a city.

Optimization of multilayer Laue lenses for a scanning X-ray microscope

2012 ◽  
Vol 20 (1) ◽  
pp. 89-97 ◽  
Author(s):  
Hanfei Yan ◽  
Yong S. Chu
Keyword(s):  
Light Source ◽  
Careful Consideration ◽  
Nanometer Scale ◽  
X Rays ◽  
National Synchrotron Light Source ◽  
X Ray ◽  
Synchrotron Light ◽  
Working Distance

Multilayer Laue lenses (MLLs) have demonstrated great capabilities for efficiently focusing hard X-rays down to the nanometer scale. Optimized use of MLLs in a scanning X-ray microscope requires careful consideration of a number of practical parameters other than resolution and efficiency in order to optimize the microscope's performance and scientific throughput. Here, relationships among the apodization effect owing to the presence of a beamstop, the monochromaticity requirement and the allowable working distance are discussed, as well as their impacts on the performance of the optics. Based on these discussions, optimal MLL schemes aiming at 10 nm resolution for a scanning X-ray microscope for the Hard X-ray Nanoprobe (HXN) beamline at National Synchrotron Light Source II are presented.

scholarly journals I04-1, a future 'fragment screening' beamline facility at Diamond Light Source

2014 ◽  
Vol 70 (a1) ◽  
pp. C790-C790
Author(s):  
Alice Douangamath ◽  
Jose Brandao-Neto ◽  
Mark Williams ◽  
Richard Fearn ◽  
Tobias Krojer ◽  
...  
Keyword(s):  
Light Source ◽  
Macromolecular Crystallography ◽  
New Developments ◽  
X Ray ◽  
X Ray Crystallography ◽  
Fragment Screening ◽  
The Third ◽  
Synchrotron Light ◽  
Set Up ◽  
The Uk

I04-1 is one of the six macromolecular crystallography (MX) beamlines at Diamond Light Source (DLS), the third generation synchrotron light source in the UK. It was built and delivered in 2010 as a stable and reliable fixed-wavelength MX station. It is currently preparing to release its user programme for exploiting fragment screening using X-ray crystallography in structural medicinal chemistry projects. For this purpose, the beamline has been going through several upgrades in order to achieve unattended high-throughput ligand crystallography. The new developments are aiming at improving the flux, stability and reliability of the beamline and its auto-alignment. In parallel, a peripheral laboratory is being set up to provide a facility for medium throughput compound soaking. Jointly with the Structural Genomics Consortium (SGC), a semi-automatic crystal soaking and harvesting scheme, which will provide hundreds of MX samples per day, is being tested at DLS. The beamline can currently process 400 crystals per day. However, the recent upgrades and automation should further improve that throughput. In this presentation, we will summarise the current specifications of the beamline and its new features, the development of a peripheral laboratory for compounds soaking and underline the remaining work.

scholarly journals Within the Lack of Chest COVID-19 X-ray Dataset: A Novel Detection Model Based on GAN and Deep Transfer Learning

Symmetry ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 651 ◽  
Author(s):  
Mohamed Loey ◽  
Florentin Smarandache ◽  
Nour Eldeen M. Khalifa
Keyword(s):  
Transfer Learning ◽  
Healthcare Systems ◽  
World Health ◽  
Transfer Model ◽  
X Rays ◽  
Computer Algorithms ◽  
X Ray ◽  
The Third ◽  
The World ◽  
Testing Accuracy

The coronavirus (COVID-19) pandemic is putting healthcare systems across the world under unprecedented and increasing pressure according to the World Health Organization (WHO). With the advances in computer algorithms and especially Artificial Intelligence, the detection of this type of virus in the early stages will help in fast recovery and help in releasing the pressure off healthcare systems. In this paper, a GAN with deep transfer learning for coronavirus detection in chest X-ray images is presented. The lack of datasets for COVID-19 especially in chest X-rays images is the main motivation of this scientific study. The main idea is to collect all the possible images for COVID-19 that exists until the writing of this research and use the GAN network to generate more images to help in the detection of this virus from the available X-rays images with the highest accuracy possible. The dataset used in this research was collected from different sources and it is available for researchers to download and use it. The number of images in the collected dataset is 307 images for four different types of classes. The classes are the COVID-19, normal, pneumonia bacterial, and pneumonia virus. Three deep transfer models are selected in this research for investigation. The models are the Alexnet, Googlenet, and Restnet18. Those models are selected for investigation through this research as it contains a small number of layers on their architectures, this will result in reducing the complexity, the consumed memory and the execution time for the proposed model. Three case scenarios are tested through the paper, the first scenario includes four classes from the dataset, while the second scenario includes 3 classes and the third scenario includes two classes. All the scenarios include the COVID-19 class as it is the main target of this research to be detected. In the first scenario, the Googlenet is selected to be the main deep transfer model as it achieves 80.6% in testing accuracy. In the second scenario, the Alexnet is selected to be the main deep transfer model as it achieves 85.2% in testing accuracy, while in the third scenario which includes two classes (COVID-19, and normal), Googlenet is selected to be the main deep transfer model as it achieves 100% in testing accuracy and 99.9% in the validation accuracy. All the performance measurement strengthens the obtained results through the research.

scholarly journals Fabrication and testing of a newly designed slit system for depth-resolved X-ray diffraction measurements

2016 ◽  
Vol 23 (6) ◽  
pp. 1296-1304 ◽  
Author(s):  
John Sinsheimer ◽  
Nathalie Bouet ◽  
Sanjit Ghose ◽  
Eric Dooryhee ◽  
Ray Conley
Keyword(s):  
Light Source ◽  
X Rays ◽  
X Ray Diffraction ◽  
National Synchrotron Light Source ◽  
X Ray ◽  
Gauge Volume ◽  
Slit Geometry ◽  
Slit System ◽  
Synchrotron Light ◽  
Improved Design

A new system of slits called `spiderweb slits' have been developed for depth-resolved powder or polycrystalline X-ray diffraction measurements. The slits act on diffracted X-rays to select a particular gauge volume of sample, while absorbing diffracted X-rays from outside of this volume. Although the slit geometry is to some extent similar to that of previously developed conical slits or spiral slits, this new design has advantages over the previous ones in use for complex heterogeneous materials andin situandoperandodiffraction measurements. For example, the slits can measure a majority of any diffraction cone for any polycrystalline material, over a continuous range of diffraction angles, and work for X-ray energies of tens to hundreds of kiloelectronvolts. The design is generated and optimized using ray-tracing simulations, and fabricated through laser micromachining. The first prototype was successfully tested at the X17A beamline at the National Synchrotron Light Source, and shows similar performance to simulations, demonstrating gauge volume selection for standard powders, for all diffraction peaks over angles of 2–10°. A similar, but improved, design will be implemented at the X-ray Powder Diffraction beamline at the National Synchrotron Light Source II.

scholarly journals Il Museo di Storia Naturale dell'Università degli Studi di Firenze VOL. 1 LE COLLEZIONI DELLA SPECOLA

2009 ◽  
Keyword(s):  
Important Research ◽  
Research Activity ◽  
The Third ◽  
The People ◽  
The World ◽  
History Of ◽  
History Of The University ◽  
University Of Florence ◽  
The University ◽  
Selection Of

The Museum of Natural History of the University of Florence, founded in 1775 by the Grand Duke Peter Leopold, is the oldest scientific museum in Europe. Firenze University Press opens the series dealing with the six sections of the Museum with this book on La Specola, situated in Palazzo Torrigiani, which represented the original nucleus. The articles in the first section reconstruct the historic background, the foundation of La Specola and the genesis and development of the collections. The second part considers the anatomical waxes, the entomological collections, and those of the vertebrates and the invertebrates, with a view to providing a description of the precious specimens that is at once precise and accessible. Finally, the third section completes the picture, retracing the important research activity that has accompanied the history of La Specola and reporting on the scientific projects in which the personnel are engaged. The largest collection in the world of anatomical wax models and the vast zoological collection are illustrated by the people directly involved in the related research, and by a superb selection of original photos produced specially for this publication.

A Short Modern History of Studying Sacrobosco’s De sphaera

2020 ◽  
Vol 65 (Special Issue) ◽  
pp. 23-33
Author(s):  
Alin Constantin Corfu
Keyword(s):  
20Th Century ◽  
Modern History ◽  
13Th Century ◽  
The Third ◽  
History Of ◽  
University Of Paris ◽  
The University

"A Short Modern History of Studying Sacrobosco’s De sphaera. The treatise generally known as De sphaera offered at the beginning of the 13th century a general image of the structure of the cosmos. In this paper I’m first trying to present a triple stake with which this treaty of Johannes de Sacrobosco (c. 1195 - c. 1256). This effort is intended to draw a context upon the treaty on which I will present in the second part of this paper namely, a short modern history of studying this treaty starting from the beginning of the 20th century up to this day. The first stake consists in the well-known episode of translation of the XI-XII centuries in the Latin milieu of the Greek and Arabic treaties. The treatise De sphaera taking over, assimilating and comparing some of the new translations of the texts dedicated to astronomy. The second Consists in the fact that Sacrobosco`s work can be considered a response to a need of renewal of the curriculum dedicated to astronomy at the University of Paris. And the third consists in the novelty and the need to use the De sphaera treatise in the Parisian University’s curriculum of the 13th century. Keywords: astronomy, translation, university, 13th Century, Sacrobosco, Paris, curriculum"

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