Numerical Modelling for Evaluation of Biological Effects Due to High Frequency Radiations in Indoor Environment

PIERS Online ◽  
2010 ◽  
Vol 6 (3) ◽  
pp. 247-251
Author(s):  
Matteo Cacciola ◽  
G. Megali ◽  
Diego Pellicano ◽  
M. Versaci ◽  
Francesco Carlo Morabito
Keyword(s):  
Numerical Modelling ◽  
High Frequency ◽  
Indoor Environment ◽  
Biological Effects

scholarly journals RTLIO: Real-Time LiDAR-Inertial Odometry and Mapping for UAVs

Sensors ◽  
2021 ◽  
Vol 21 (12) ◽  
pp. 3955
Author(s):  
Jung-Cheng Yang ◽  
Chun-Jung Lin ◽  
Bing-Yuan You ◽  
Yin-Long Yan ◽  
Teng-Hu Cheng
Keyword(s):  
Feedback Control ◽  
Real Time ◽  
High Frequency ◽  
Indoor Environment ◽  
Indoor Localization ◽  
Sampling Rate ◽  
Outdoor Environment ◽  
Position Accuracy ◽  
Graph Optimization ◽  
Pose Graph Optimization

Most UAVs rely on GPS for localization in an outdoor environment. However, in GPS-denied environment, other sources of localization are required for UAVs to conduct feedback control and navigation. LiDAR has been used for indoor localization, but the sampling rate is usually too low for feedback control of UAVs. To compensate this drawback, IMU sensors are usually fused to generate high-frequency odometry, with only few extra computation resources. To achieve this goal, a real-time LiDAR inertial odometer system (RTLIO) is developed in this work to generate high-precision and high-frequency odometry for the feedback control of UAVs in an indoor environment, and this is achieved by solving cost functions that consist of the LiDAR and IMU residuals. Compared to the traditional LIO approach, the initialization process of the developed RTLIO can be achieved, even when the device is stationary. To further reduce the accumulated pose errors, loop closure and pose-graph optimization are also developed in RTLIO. To demonstrate the efficacy of the developed RTLIO, experiments with long-range trajectory are conducted, and the results indicate that the RTLIO can outperform LIO with a smaller drift. Experiments with odometry benchmark dataset (i.e., KITTI) are also conducted to compare the performance with other methods, and the results show that the RTLIO can outperform ALOAM and LOAM in terms of exhibiting a smaller time delay and greater position accuracy.

CERTAIN BIOLOGICAL EFFECTS OF HIGH FREQUENCY FIELDS

Science ◽  
1930 ◽  
Vol 71 (1845) ◽  
pp. 490-490 ◽  
Author(s):  
G. M. Mckinley ◽  
D. R. Charles
Keyword(s):  
High Frequency ◽  
Biological Effects

High frequency numerical modelling using measured sources

2006 ◽  
Author(s):  
L. Foged ◽  
F. Mioc ◽  
B. Bencivenga ◽  
E. Di Giampaolo ◽  
M. Sabbadini
Keyword(s):  
Numerical Modelling ◽  
High Frequency

scholarly journals High frequency ghost cavitation - a comparison of two seismic air-gun arrays using numerical modelling

2017 ◽  
Vol 125 ◽  
pp. 153-160 ◽  
Author(s):  
Babak Khodabandeloo ◽  
Martin Landrø
Keyword(s):  
Numerical Modelling ◽  
High Frequency ◽  
Air Gun

scholarly journals Biological Effects of Exposure to High Frequency Electromagnetism on Rabbits and Guinea Pigs

1992 ◽  
Vol 41 (4) ◽  
pp. 421-435
Author(s):  
Yoshiko AOYAMA ◽  
Yasushi UEDA ◽  
Motohiko KURITA ◽  
Hidenori OHASHI ◽  
Chikao TORIGATA ◽  
...  
Keyword(s):  
High Frequency ◽  
Guinea Pigs ◽  
Biological Effects

scholarly journals PC 12 Pheochromocytoma Cell Response to Super High Frequency Terahertz Radiation from Synchrotron Source

Cancers ◽  
2019 ◽  
Vol 11 (2) ◽  
pp. 162 ◽  
Author(s):  
Palalle Perera ◽  
Dominique Appadoo ◽  
Samuel Cheeseman ◽  
Jason Wandiyanto ◽  
Denver Linklater ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Cell Membrane ◽  
Electromagnetic Radiation ◽  
High Frequency ◽  
Biological Effects ◽  
Cell Membrane Permeability ◽  
Temporary Increase ◽  
Thz Radiation ◽  
Synchrotron Source ◽  
Pc 12 Cells

High frequency (HF) electromagnetic fields (EMFs) have been widely used in many wireless communication devices, yet within the terahertz (THz) range, their effects on biological systems are poorly understood. In this study, electromagnetic radiation in the range of 0.3–19.5 × 1012 Hz, generated using a synchrotron light source, was used to investigate the response of PC 12 neuron-like pheochromocytoma cells to THz irradiation. The PC 12 cells remained viable and physiologically healthy, as confirmed by a panel of biological assays; however, exposure to THz radiation for 10 min at 25.2 ± 0.4 °C was sufficient to induce a temporary increase in their cell membrane permeability. High-resolution transmission electron microscopy (TEM) confirmed cell membrane permeabilization via visualisation of the translocation of silica nanospheres (d = 23.5 ± 0.2 nm) and their clusters (d = 63 nm) into the PC 12 cells. Analysis of scanning electron microscopy (SEM) micrographs revealed the formation of atypically large (up to 1 µm) blebs on the surface of PC 12 cells when exposed to THz radiation. Long-term analysis showed no substantial differences in metabolic activity between the PC 12 cells exposed to THz radiation and untreated cells; however, a higher population of the THz-treated PC 12 cells responded to the nerve growth factor (NGF) by extending longer neurites (up to 0–20 µm) compared to the untreated PC12 cells (up to 20 µm). These findings present implications for the development of nanoparticle-mediated drug delivery and gene therapy strategies since THz irradiation can promote nanoparticle uptake by cells without causing apoptosis, necrosis or physiological damage, as well as provide a deeper fundamental insight into the biological effects of environmental exposure of cells to electromagnetic radiation of super high frequencies.

scholarly journals Numerical modelling of PCB planar inductors: impact of 3D modelling on high‐frequency copper loss evaluation

2017 ◽  
Vol 10 (14) ◽  
pp. 1966-1974 ◽  
Author(s):  
Laurent Taylor ◽  
Xavier Margueron ◽  
Yvonnick Le Menach ◽  
Philippe Le Moigne
Keyword(s):  
Numerical Modelling ◽  
High Frequency ◽  
3D Modelling ◽  
Copper Loss

COMPARATIVE CYTOLOGICAL EFFECTS OF THE PESTICIDES MENAZON, METROBROMURON AND TETRACHLOROISOPHTHALONITRILE INHORDEUMANDTRADESCANTIA

1972 ◽  
Vol 14 (2) ◽  
pp. 245-256 ◽  
Author(s):  
D. J. Tomkins ◽  
W. F. Grant
Keyword(s):  
High Frequency ◽  
Biological Effects ◽  
Germination Percentage ◽  
Physiological Effect ◽  
Seedling Height ◽  
X Rays ◽  
Hordeum Vulgare L ◽  
Chromosome Breaks ◽  
X Irradiation ◽  
Cytogenetic Action

The biological effects of an s-triazine insecticide: menazon (MEN), a substituted urea herbicide: metobromuron (PAT) and an aromatic hydrocarbon fungicide: tetrachloroisophthalonitrile (DAC) were compared with those of ethylmethanesulfonate (EMS) and X-irradiation. Seeds of barley (Hordeum vulgare L.) were soaked in solutions of the chemicals before determining percentage germination, seedling height and frequency of chromosomal aberrations. In addition, somatic mutations in inflorescences of Tradescantia clone 02 treated with solutions of the chemicals were counted. X-rays induced a high frequency of chromosome breaks but had no effect on any other character. In contrast, EMS had a pronounced effect on all the characters studied. Only one pesticide, PAT, had significant effects. The herbicide reduced germination percentage, seedling height and the mitotic index in barley. It is concluded that EMS and X-rays have a cytogenetic action in the treated cells, whereas PAT induced a severe physiological effect.

Numerical modelling of industrial scale high frequency welding of cladded pipes

2018 ◽  
Vol 13 (1/2) ◽  
pp. 27
Author(s):  
Egbert Baake ◽  
Martin Kroll ◽  
Alexander Nikanorov ◽  
Wladimir Ebel
Keyword(s):  
Numerical Modelling ◽  
High Frequency ◽  
Industrial Scale
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