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Anechoic and Reverberation Chambers
<p><b>A Comprehensive Review of the Recent Advances in Anechoic Chamber and Reverberation Chamber Designs and Measurements</b></p> <p><i>Anechoic and Reverberation Chambers</i> is a guide to the latest systematic solutions for designing anechoic chambers that rely on state-of-the-art computational electromagnetic algorithms. This essential resource contains a theoretical and practical understanding for electromagnetic compatibility and antenna testing. The solutions outlined optimise chamber performance in the structure, absorber layout and antenna positions whilst minimising the overall cost. The anechoic chamber designs are verified by measurement results from Microwave Vision Group that validate the accuracy of the solution.</p> <p><i>Anechoic and Reverberation Chambers</i> fills an important gap in the literature by providing a comprehensive reference to electromagnetic measurements, applications and over-the-air tests inside chambers. The expert contributors offer a summary of the latest developments in anechoic and reverberation chambers to help scientists and engineers apply the most recent technologies in the field. In addition, the book contains a comparison between reverberation and anechoic chambers and identifies their strengths and weaknesses. This important resource:</p> <ul> <li>Provides a systematic solution for anechoic chamber design by using state-of-the-art computational electromagnetic algorithms</li> <li>Examines both types of chamber in use, comparing and contrasting the advantages and disadvantages of each</li> <li>Reviews typical over-the-air measurements and new applications in reverberation chambers</li> <li>Offers a timely and complete reference written by authors working at the cutting edge of the technology</li> <li>Contains helpful illustrations, photographs, practical examples and comparisons between measurements and simulations</li> </ul> <p>Written for both academics and industrial engineers and designers, <i>Anechoic and Reverberation Chambers</i> explores the most recent advances in anechoic chamber and reverberation chamber designs and measurements.</p>
eBook
A novel profilometer based on cylindrical ionization chambers for electron beam diagnostics
In this work is proposed to use the profilometer based on thin cylindrical ionization chambers as a tool for electron beam diagnostics. The suggested device is based on multi-angle scanning method. To test this profilometer system experimental studies on microtron MT-25 were conducted in which were measured transverse distributions of electron beam intensity at different distances. Results show the efficacy of using a novel profilometer with set of ionization chambers as part of detector system for measurement the real spatial characteristics of a given electron beam.
Journal Article
Digital slit lamp derived parameters in shallow anterior chamber screening
To evaluate anterior chamber depth (ACD) using diffraction parameters derived from slit-lamp anterior segment (AS) images and assess their diagnostic efficacy in identifying optimal cutoff values for shallow ACD screening. In this cross-sectional study, from September 21, 2022 to June 30, 2023, 75 volunteers (150 eyes). Slit-lamp images (450 images, 3 pictures per eye) were taken, and the ACD was determined using an IOL Master 700. After manual annotation of the anatomical landmarks, the anterior chamber cross-sectional area (ACCSA) and anterior chamber angle (ACA) of the slit-lamp images were measured. Pixel was applied after image processing and feature extraction to predict the ACD. These values were then compared with the ACD acquired from the IOLMaster 700. The correlation between the parameters of the two techniques was determined by Pearson correlation analysis. The anterior chamber area (ACA) under the receiver operating characteristic curve (AUC) was calculated to evaluate the diagnostic efficacy of relevant indicators on images of the ACD. A total of 450 photographs(207 shallow AC and 243 deep AC images) were analyzed. The nasal/temporal anterior chamber cross-sectional area (N/TACCSA), the sum of the cross-sectional areas of the central and nasal/temporal anterior chambers (SACCSA), and nasal/temporal anterior chamber angle (N/TACA) achieved better performance (AUC = 0.819, 95% confidence interval (CI) = 0.752–0.887; AUC = 0.818, 95% CI = 0.748–0.887 and AUC = 0.833, 95% CI = 0.766–0.899, respectively). The image parameter values were strongly positively correlated with the ACD of IOLMaster 700 (central anterior chamber cross-sectional area (CACCSA, N/TACCSA, SACSA, and N/TACA,
R
= 0.603, 0.651, 0.645, and 0.665,
P
< 0.01, respectively). Some image parameters not only had a strong positive correlation with the measured ACD values from the IOLMaster 700 but also had the ability to screen for shallow ACD. This study suggested the possibility of estimating the central ACD using AS images.
Journal Article
Reforming senates : upper legislative houses in North Atlantic small powers, 1800-present
\"This original and new study of senates in small powers across the North Atlantic shows that the establishment and reform of these upper legislative houses have followed remarkably parallel trajectories. Senate reforms emerged in the wake of deep political crises within the Atlantic World, and were influenced by the comparatively weak positions of small powers. Reformers responded to crises and constantly looked beyond borders and oceans for inspiration to keep their senates relevant\"-- Provided by publisher.
Book
A Versatile Sample Chamber for BioSAXS: Integration and Applications on the P12 Beamline
We present the integration of a sample chamber for advanced BioSAXS measurement on the P12 beamline of EMBL Hamburg. The sample chamber is designed to be installed in the beamline P12 at PETRA and BM29 at ESRF with minimal effort to swap the standard sample environment, allowing for a fast and efficient beamline configuration change. The new sample chamber is equipped with an on-axis microscope, including front and back illumination, for sample visualization; an XYZ piezo stage for fine alignment of sample into the beam; an optical port for in situ spectroscopy; and fluidics feedthroughs. This sample environment has been fully integrated on the P12 beamline and employed in users project for scanning SAXS and in vacuum microfluidics applications.
Journal Article
Connecting the dots : lessons for leadership in a startup world
Silicon Valley visionary John Chambers shares the lessons that transformed a dyslexic kid from West Virginia into one of the world's best business leaders and turned a simple router company into a global tech titan.
Book
Life test and inner bore damage analysis of high chamber pressure gun barrel
This paper is devoted to research the inner bore damage laws of high chamber pressure tank gun barrel, A larger caliber tank gun barrel is chosen as study object and a full life test is conducted for this barrel, three life-related parameters(muzzle velocity, chamber pressure and inner bore size) are measured during the test. The life of this gun barrel is judged to end according to the high chamber pressure gun barrel life criteria after 658 fired rounds. Life-related parameters variation analysis and initial erosion condition inspection of this test gun barrel are conducted after the test, and several high chamber pressure gun barrel damage laws are obtained. The damage laws have guiding significance for damage mechanism research and life enhancement technology study of high chamber pressure gun barrel.
Journal Article