Near-field surface displacement and permanent deformation induced by the Alaska Mw 7.5 earthquake determined by high-rate real-time ambiguity-fixed PPP solutions

We present a real-time rendering technique for photometric polygonal lights. Our method uses a numerical integration technique based on a triangulation to calculate noise-free diffuse shading. We include a dynamic point in the triangulation that provides a continuous near-field illumination resembling the shape of the light emitter and its characteristics. We evaluate the accuracy of our approach with a diverse selection of photometric measurement data sets in a comprehensive benchmark framework. Furthermore, we provide an extension for specular reflection on surfaces with arbitrary roughness that facilitates the use of existing real-time shading techniques. Our technique is easy to integrate into real-time rendering systems and extends the range of possible applications with photometric area lights.

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Towards real-time fire data synthesis using numerical simulations

Journal of Fire Sciences ◽

10.1177/0734904121993449 ◽

2021 ◽

pp. 073490412199344

Author(s):

Wolfram Jahn ◽

Frane Sazunic ◽

Carlos Sing-Long

Keyword(s):

Real Time ◽

Computational Fluid Dynamic ◽

Dynamic Models ◽

Fluid Dynamic ◽

Near Field ◽

Computing Time ◽

Temperature Correction ◽

Dynamic Simulations ◽

Conservation Of Energy ◽

Fire Scenarios

Synthesising data from fire scenarios using fire simulations requires iterative running of these simulations. For real-time synthesising, faster-than-real-time simulations are thus necessary. In this article, different model types are assessed according to their complexity to determine the trade-off between the accuracy of the output and the required computing time. A threshold grid size for real-time computational fluid dynamic simulations is identified, and the implications of simplifying existing field fire models by turning off sub-models are assessed. In addition, a temperature correction for two zone models based on the conservation of energy of the hot layer is introduced, to account for spatial variations of temperature in the near field of the fire. The main conclusions are that real-time fire simulations with spatial resolution are possible and that it is not necessary to solve all fine-scale physics to reproduce temperature measurements accurately. There remains, however, a gap in performance between computational fluid dynamic models and zone models that must be explored to achieve faster-than-real-time fire simulations.

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Investigation on Wireless Link for Medical Telemetry Including Impedance Matching of Implanted Antennas

Sensors ◽

10.3390/s21041431 ◽

2021 ◽

Vol 21 (4) ◽

pp. 1431

Author(s):

Ilkyu Kim ◽

Sun-Gyu Lee ◽

Yong-Hyun Nam ◽

Jeong-Hae Lee

Keyword(s):

Real Time ◽

Human Body ◽

Near Field ◽

Impedance Matching ◽

The Body ◽

Field Pattern ◽

Communication Link ◽

Far Field ◽

Antenna Coupling ◽

Medical Telemetry

The development of biomedical devices benefits patients by offering real-time healthcare. In particular, pacemakers have gained a great deal of attention because they offer opportunities for monitoring the patient’s vitals and biological statics in real time. One of the important factors in realizing real-time body-centric sensing is to establish a robust wireless communication link among the medical devices. In this paper, radio transmission and the optimal characteristics for impedance matching the medical telemetry of an implant are investigated. For radio transmission, an integral coupling formula based on 3D vector far-field patterns was firstly applied to compute the antenna coupling between two antennas placed inside and outside of the body. The formula provides the capability for computing the antenna coupling in the near-field and far-field region. In order to include the effects of human implantation, the far-field pattern was characterized taking into account a sphere enclosing an antenna made of human tissue. Furthermore, the characteristics of impedance matching inside the human body were studied by means of inherent wave impedances of electrical and magnetic dipoles. Here, we demonstrate that the implantation of a magnetic dipole is advantageous because it provides similar impedance characteristics to those of the human body.

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Real-Time Near-Field Terahertz Field Imaging

Terahertz Wave Detection and Imaging with a Hot Rydberg Vapour - Springer Theses ◽

10.1007/978-3-319-94908-6_7 ◽

2018 ◽

pp. 65-76

Author(s):

Christopher G. Wade

Keyword(s):

Real Time ◽

Near Field ◽

Field Imaging

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Real-Time Focal Spot Profiling for the Adjustment of the Focus in Near Field Recording System

Japanese Journal of Applied Physics ◽

10.1143/jjap.41.6380 ◽

2002 ◽

Vol 41 (Part 1, No. 11A) ◽

pp. 6380-6385

Author(s):

Hyeong Ryeol Oh ◽

Dae-Gap Gweon ◽

Jun-Hee Lee ◽

Sang-Cheon Kim ◽

See-Hyung Lee ◽

...

Keyword(s):

Real Time ◽

Focal Spot ◽

Near Field ◽

Recording System ◽

Field Recording

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Determination of Underwater Plate Dynamics Using Laser Beams

Journal of Engineering for Industry ◽

10.1115/1.3438429 ◽

1974 ◽

Vol 96 (3) ◽

pp. 722-728

Author(s):

Rudolph E. Croteau ◽

Herman E. Sheets

Keyword(s):

Near Field ◽

Surface Displacement ◽

Coupled System ◽

Green Laser ◽

Testing Facility ◽

Acoustic Testing ◽

Propeller Blades ◽

The Relationship ◽

Made In

Underwater plate vibration and its associated noise are of interest for the analysis of ship structures, propeller blades, and other areas of underwater acoustics. In order to analyze the relationship between a plate vibrating underwater and the acoustic pressure in the near-field, optical interferometric holography, using a blue-green laser beam, was used to determine surface displacement for the vibrating plate, which was excited through a fluid-coupled system. Acoustic measurements of the same source were made in a water tower concurrently with the holography and later at a precision acoustic testing facility. This method permits prediction of underwater plate modal frequencies and shapes with high accuracy.

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