scholarly journals Comparison of Fracture Delineation Methods in Anteroposterior Pelvic Radiographs

2020 ◽  
Vol 2 (2) ◽  
pp. 17-29
Author(s):  
Ligisha P ◽  
Bhavani S
Keyword(s):  
Curve Fitting ◽  
Visual Complexity ◽  
High Energy ◽  
Pelvic Fractures ◽  
Detection Methods ◽  
Pelvic Bone ◽  
Fracture Detection ◽  
Vehicle Collision ◽  
Energy Incident ◽  
Elder People

Pelvic fractures are very difficult to detect due to the visual complexity of the pelvic bone. Pelvic fracture occurs less frequently, only when there is a high energy event such as fall from a height or vehicle collision. In elder people and in osteoporosis patients even a low energy incident may cause fracture. The paper includes the comparison of three different fracture detection methods – GLCM and ANN based, Statistical curve fitting and classifier based and finally statistical curve fitting and ANN based method.

Angiography in patients with pelvic fractures and contrast extravasation on CT following high-energy trauma

2021 ◽  
Author(s):  
Jonathan Hammerschlag ◽  
Yehuda Hershkovitz ◽  
Itamar Ashkenazi ◽  
Zahar Shapira ◽  
Igor Jeroukhimov
Keyword(s):  
High Energy ◽  
Pelvic Fractures ◽  
Contrast Extravasation ◽  
High Energy Trauma

scholarly journals Factors affecting mortality and reoperations in high-energy pelvic fractures

2018 ◽  
Vol 28 (7) ◽  
pp. 1273-1282 ◽  
Author(s):  
Peyman Bakhshayesh ◽  
Lars Weidenhielm ◽  
Anders Enocson
Keyword(s):  
High Energy ◽  
Pelvic Fractures ◽  
Factors Affecting

Detectors for cosmic particles, neutrinos and exotic matter

2020 ◽  
pp. 655-710
Author(s):  
Hermann Kolanoski ◽  
Norbert Wermes
Keyword(s):  
Dark Matter ◽  
Particle Physics ◽  
Cosmic Radiation ◽  
Charged Particles ◽  
Cosmic Ray ◽  
High Energy ◽  
Detection Methods ◽  
Astroparticle Physics ◽  
High Energy Cosmic Rays ◽  
Cosmic Origin

Astroparticle physics deals with the investigation of cosmic radiation using similar detection methods as in particle physics, however, mostly with quite different detector arrangements. In this chapter the detection principles for the different radiation types with cosmic origin are presented, this includes charged particles, gamma radiation, neutrinos and possibly existing Dark Matter. In the case of neutrinos also experiments at accelerators and reactors are included. Examples, which are typical for the different areas, are given for detectors and their properties. For cosmic ray detection apparatuses are deployed above the atmosphere with balloons or satellites or on the ground using the atmosphere as calorimeter in which high-energy cosmic rays develop showers or in underground areas including in water and ice.

scholarly journals Extending Nighttime Combustion Source Detection Limits with Short Wavelength VIIRS Data

2019 ◽  
Vol 11 (4) ◽  
pp. 395 ◽  
Author(s):  
Christopher Elvidge ◽  
Mikhail Zhizhin ◽  
Kimberly Baugh ◽  
Feng Hsu ◽  
Tilottama Ghosh
Keyword(s):  
Curve Fitting ◽  
Short Wavelength ◽  
Detection Limits ◽  
Source Area ◽  
High Energy ◽  
Source Detection ◽  
Combustion Source ◽  
Low Light ◽  
Spectral Bands ◽  
Combustion Sources

The Visible Infrared Imaging Radiometer Suite (VIIRS) collects low light imaging data at night in five spectral bands. The best known of these is the day/night band (DNB) which uses light intensification for imaging of moonlit clouds in the visible and near-infrared (VNIR). The other four low light imaging bands are in the NIR and short-wave infrared (SWIR), designed for daytime imaging, which continue to collect data at night. VIIRS nightfire (VNF) tests each nighttime pixel for the presence of sub-pixel IR emitters across six spectral bands with two bands each in three spectral ranges: NIR, SWIR, and MWIR. In pixels with detection in two or more bands, Planck curve fitting leads to the calculation of temperature, source area, and radiant heat using physical laws. An analysis of January 2018 global VNF found that inclusion of the NIR and SWIR channels results in a doubling of the VNF pixels with temperature fits over the detection numbers involving the MWIR. The addition of the short wavelength channels extends detection limits to smaller source areas across a broad range of temperatures. The VIIRS DNB has even lower detection limits for combustion sources, reaching 0.001 m2 at 1800 K, a typical temperature for a natural gas flare. Comparison of VNF tallies and DNB fire detections in a 2015 study area in India found the DNB had 15 times more detections than VNF. The primary VNF error sources are false detections from high energy particle detections (HEPD) in space and radiance saturation on some of the most intense events. The HEPD false detections are largely eliminated in the VNF output by requiring multiband detections for the calculation of temperature and source size. Radiance saturation occurs in about 1% of the VNF detections and occurs primarily in the M12 spectral band. Inclusion of the radiances affected by saturation results in temperature and source area calculation errors. Saturation is addressed by identifying the presence of saturation and excluding those radiances from the Planck curve fitting. The extremely low detection limits for the DNB indicates that a DNB fire detection algorithm could reveal vast numbers of combustion sources that are undetectable in longer wavelength VIIRS data. The caveats with the DNB combustion source detection capability is that it should be restricted to pixels that are outside the zone of known VIIRS detected electric lighting.

scholarly journals Photovoltaic Cell: Optimum Photon Utilisation

2016 ◽  
Vol 3 ◽  
pp. 64-85
Author(s):  
Liam Caruana ◽  
Thomas Nommensen ◽  
Toan Dinh ◽  
Dennis Tran ◽  
Robert McCormick
Keyword(s):  
Solar Cells ◽  
Solar Cell ◽  
Entropy Generation ◽  
Light Trapping ◽  
Photovoltaic Cell ◽  
High Energy ◽  
Open Circuit ◽  
Light Spectrum ◽  
Energy Incident ◽  
Global Energy Consumption

In the 21st century, global energy consumption has increased exponentially and hence, sustainable energy sources are essential to accommodate for this. Advancements within photovoltaics, in regards to light trapping, has demonstrated to be a promising field of dramatically improving the efficiency of solar cells. This improvement is done by using different nanostructures, which enables solar cells to use the light spectrum emitted more efficiently. The purpose of this meta study is to investigate irreversible entropic losses related to light trapping. In this respect, the observation is aimed at how nanostructures on a silicon substrate captures high energy incident photons. Furthermore, different types of nanostructures are then investigated and compared, using the étendue ratio during light trapping. It is predicted that étendue mismatching is a parasitic entropy generation variable, and that the matching has an effect on the open circuit voltage of the solar cell. Although solar cells do have their limiting efficiencies, according to the Shockley-Queisser theory and Yablonovitch limit, with careful engineering and manufacturing practices, these irreversible entropic losses could be minimized. Further research in energy losses, due to entropy generation, may guide nanostructures and photonics in exceeding past these limits.Keywords: Photovoltaic cell; Shockley-Queisser; Solar cell nanostructures; Solar cell intrinsic and extrinsic losses; entropy; étendue; light trapping; Shockley Queisser; Geometry; Meta-study

(ii) Management of high-energy pelvic fractures

2003 ◽  
Vol 17 (5) ◽  
pp. 335-345 ◽  
Author(s):  
David J.G Stephen
Keyword(s):  
High Energy ◽  
Pelvic Fractures

Pre-hospital and emergency department management of pelvic fractures and major trauma centre status: Has practice changed?

Trauma ◽  
2016 ◽  
Vol 19 (3) ◽  
pp. 207-211
Author(s):  
Jonathan Barnes ◽  
Philip Thomas ◽  
Ramsay Refaie ◽  
Andrew Gray
Keyword(s):  
Emergency Department ◽  
Clinical Practice ◽  
Pelvic Fracture ◽  
Major Trauma ◽  
High Energy ◽  
Trauma Centre ◽  
Pelvic Fractures ◽  
Major Trauma Centre ◽  
Initial Imaging ◽  
One Year

Introduction Pelvic fractures are indicative of high-energy injuries and carry a significant morbidity and mortality and pelvic binders are used to stabilise them in both the pre-hospital and emergency department setting. Our unit gained major trauma centre status in April 2012 as part of a national programme to centralise trauma care and improve outcomes. This study investigated whether major trauma centre status led to a change in workload and clinical practice at our centre. Methods A retrospective analysis of all patients admitted with a pelvic fracture for the six-month periods before, after and at one-year following major trauma centre status designation. Data were retrospectively collected from electronic patient records and binder placement assessed using an accepted method. Patients with isolated pubic rami fractures were excluded. Results Overall, 6/16 (37.5%) pelvic fracture admissions had a binder placed pre-major trauma centre status, rising to 14/34 (41.2%) immediately post-major trauma centre status and 22/32 (68.8%) ( p = 0.025) one year later. Binders were positioned accurately in 4 patients (80%, one exclusion) pre-major trauma centre status, 12 (92.4%) post-major trauma centre status and 22 (100%) at one year. CT imaging was the initial imaging used in 9 (56.3%) patients pre-major trauma centre status, 29 (85.3%) ( p = 0.04) post-major trauma centre status and 27 (84.4%) at one year. Discussion Pelvic fracture admissions doubled following major trauma centre status. Computed tomography, as the initial imaging modality, increased significantly with major trauma centre status, likely a reflection of the increased resources made available with this change. Although binder application rates did not change immediately, a significant improvement was seen after one year, with binder accuracy increasing to 100%. This suggests that although changes in clinical practice often do not occur immediately, with the increased infrastructure and clinical exposure afforded through centralisation of trauma services, they will occur, ultimately leading to improvements in trauma patient care.

Depth Profiles of High-energy Recoil Implantation of Boron into Silicon

2000 ◽  
Vol 610 ◽  
Author(s):  
Lin Shao ◽  
Xinming Lu ◽  
Jianyue Jin ◽  
Qinmian Li ◽  
Irene Rusakova ◽  
...  
Keyword(s):  
Ion Beam ◽  
High Energy ◽  
Implantation Energy ◽  
Strong Function ◽  
Recoil Implantation ◽  
Depth Profiles ◽  
Calculation Results ◽  
Energy Incident ◽  
Sims Analysis ◽  
Secondary Ion

AbstractWe have studied boron profiles by using the ion beam recoil implantation. A boron layer was first deposited onto Si, followed by irradiation with Si ions at various energies to knock the boron. Conventional belief is that the higher the implantation energy, the deeper the recoil profiles. While this is true for low-energy incident ions, we show here that the situation is reversed for incident Si ions of higher energy due to the fact that recoil probability at a given angle is a strong function of the energy of the primary projectile. Our experiments show that 500-keV high-energy recoil implantation produces a shallower B profile than lower-energy implantation such as 10 keV and 50 keV. The secondary-ion-massspectrometry (SIMS) analysis shows that the distribution of recoiled B atoms scattered by the energetic Si ions agrees with our calculation results. Sub-100 nm p+/n junctions have been realized with a 500-keV Si ion beam.

scholarly journals A Delayed and Rather Unusual Presentation of a Bladder Injury after Pelvic Trauma: 5 Years after a Road Traffic Accident

2014 ◽  
Vol 2014 ◽  
pp. 1-3 ◽  
Author(s):  
Nikolaos Davarinos ◽  
John Thornhill ◽  
JP McElwain ◽  
David Moore
Keyword(s):  
Traffic Accident ◽  
Road Traffic ◽  
High Energy ◽  
Pelvic Trauma ◽  
Careful Consideration ◽  
Pelvic Fractures ◽  
Unusual Presentation ◽  
Systematic Evaluation ◽  
Bladder Injury ◽  
Associated Injuries

Associated injuries frequently occur in patients who sustain fractures of the pelvis. Specifically, high-energy trauma resulting in pelvic fractures places the bladder and urethra at risk for injury, often resulting in significant complications. Timely identification and management of genitourinary injuries minimize associated morbidity. Prompt injury identification depends upon a systematic evaluation with careful consideration of the mechanism of injury. Physical examination is pertinent as well as analysis of the urine and appropriate diagnostic imaging. Despite such increased vigilance genitourinary injuries get missed and delayed presentations in the order of a few weeks have been well documented. To our knowledge, this is the first report of its kind in the literature showing such a particularly delayed (5 years) and rather unusual presentation of a bladder injury after pelvic trauma.

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