There is, I think, something ethereal about i —the square root of minus one. I remember first hearing about it at school. It seemed an odd beast at that time—an intruder hovering on the edge of reality.

Usually familiarity dulls this sense of the bizarre, but in the case of i it was the reverse: over the years the sense of its surreal nature intensified. It seemed that it was impossible to write mathematics that described the real world in …

I and i

https://biblio.ugent.be/publication/685594/file/1130605.pdf

Review of Particle Physics

/pdf/review-of-particle-physics-1996-1997-jeg703df6k.pdf

Review of Particle Physics, 1996-1997

Low-energy phenomenology of superstring-inspired E6 models

In this paper, we examine the role of polarimetry in synthetic aperture radar (SAR) interferometry. We first propose a general formulation for vector wave interferometry that includes conventional scalar interferometry as a special case. Then, we show how polarimetric basis transformations can be introduced into SAR interferometry and applied to form interferograms between all possible linear combinations of polarization states. This allows us to reveal the strong polarization dependency of the interferometric coherence. We then solve the coherence optimization problem involving maximization of interferometric coherence and formulate a new coherent decomposition for polarimetric SAR interferometry that allows the separation of the effective phase centers of different scattering mechanisms. A simplified stochastic scattering model for an elevated forest canopy is introduced to demonstrate the effectiveness of the proposed algorithms. In this way, we demonstrate the importance of wave polarization for the physical interpretation of SAR interferograms. We investigate the potential of polarimetric SAR interferometry using results from the evaluation of fully polarimetric interferometric shuttle imaging radar (SIR)-C/X-SAR data collected during October 8-9, 1994, over the SE Baikal Lake Selenga delta region of Buriatia, Southeast Siberia, Russia.

Polarimetric SAR interferometry

To introduce shock wave as a new treatment modality for the lesions in the vicinity of brain and skull, pressure-dependent brain damages after exposure of shock wave were investigated. A novel compact Ho:YAG laser-induced cavitational shock wave generator (diameter: 15 mm, weight: 20g) was used intstead of clinical lithotriptors due to their wide distribution of shock waves. In the first part, we have developed and investigated characteristics of present generator by means of high-speed photography, shadowgraphy, and pressure measurement. Generation of localized shock wave without harmful effect of laser was observed after irradiation of Ho:YAG laser in the brass tube with internal water supply. Mechanical effect of accompanying laser-induced liquid jet was mitigated after placement of latex diaphragm with acrylic water reservoir. Maximum overpressure of generated shock wave was 15 MPa before placement of diaphragm, and 5 MPa after placement of diaphragm. In the second part, shock wave-induced brain damages were investigated in 5 male Sprague-Dawley rats. While subarachnoid hemorrhage could be observed between 1 and 5 MPa, intracerebral hemorrhage, and laceration of tissue were also observed above 5 MPa. We therefore conclude that overpressure of exposing shock wave over brain surface should be managed under 1 MPa.

Biological effect of shock waves on rat brain: pathological evaluation by compact Ho:YAG-laser-induced cavitational shock wave generator

Geophysical assessment of the hydraulic property of the fracture systems around Lake Nasser-Egypt: In sight of polarimetric borehole radar

ALIS is a hand-held dual sensor developed by Tohoku University, Japan since 2002. Dual sensor is a general name of
sensor for humanitarian demining, which are equipped with metal detector and GPR. ALIS is only one hand-held dual
sensor, which can record the sensor position with sensor signals. Therefore, the data can be processed after data
acquisition, and can increase the imaging capability. ALIS has been tested in some mine affected courtiers including
Afghanistan (2004), Egypt(2005), Croatia(2006-) and Cambodia(2007-). Mine fields at each country has different
conditions and soil types. Therefore testes at the real mine fields are very important. ALIS has detected more than 30
AP-Mines in evaluation test in Cambodia held in 2009.

Evaluation test of ALIS in Cambodia for humanitarian demining

In this paper, the first detection result of coherent scatterers (CSs) in forest environment is addressed. As a scatterer associated with CS, the dihedral structure consists of the tree-trunk like a vertical cylinder and the ground surface is assumed. The potential of CSs as being the phase stable scatterers as permanent scatterers will be also demonstrated with P-&L-band Pol-InSAR datasets acquired in repeat-pass InSAR mode over boreal forest test site by German Aerospace Center's E-SAR airborne system.

/pdf/coherent-scatterer-in-forest-environment-detection-4etoq35yyx.pdf

Coherent scatterer in forest environment: Detection, properties and its applications

In order to demonstrate the possibility of Ground Penetrating Radar (GPR) for detection of small buried objects such as
landmine and UXO, conducted demonstration tests by using the 3DGPR system, which is a GPR system combined with
high accuracy positing system using a commercial laser positioning system (iGPS). iGPS can provide absolute and better
than centimetre precise x,y,z coordinates to multiple mine sensors at the same time. The developed " 3DGPR" system is
efficient and capable of high-resolution 3D shallow subsurface scanning of larger areas (25 m2 to thousands of square
meters) with irregular topography . Field test by using a 500MHz GPR system equipped with 3DGPR system was
conducted. PMN-2 and Type-72 mine models have been buried at the depth of 5-20cm in sand. We could demonstrate
that the 3DGPR can visualize each of these buried land mines very clearly.

https://www.spiedigitallibrary.org/conference-proceedings-of-spie/8357/835710/Landmine-detection-by-3D-GPR-system/10.1117/12.918517.pdf

Motoyuki Sato

Papers

Biological effect of shock waves on rat brain: pathological evaluation by compact Ho:YAG-laser-induced cavitational shock wave generator

Geophysical assessment of the hydraulic property of the fracture systems around Lake Nasser-Egypt: In sight of polarimetric borehole radar

Evaluation test of ALIS in Cambodia for humanitarian demining

Coherent scatterer in forest environment: Detection, properties and its applications

Landmine detection by 3D GPR system