Source mechanism of the ignition of some secondary explosives by a monochromatic light pulse

1985 ◽  
Vol 21 (1) ◽  
pp. 38-41 ◽  
Author(s):  
L. G. Strakovskii
Keyword(s):  
Light Pulse ◽  
Monochromatic Light ◽  
Source Mechanism

Contactless Deep Level Transient Spectroscopy Using Microwave Reflection

1990 ◽  
Vol 209 ◽  
Author(s):  
M. S. Wang ◽  
J. M. Borrego
Keyword(s):  
Conduction Band ◽  
Light Pulse ◽  
Deep Level Transient Spectroscopy ◽  
Gaas Substrate ◽  
Deep Level ◽  
Monochromatic Light ◽  
Hene Laser ◽  
Special Sample Preparation ◽  
Microwave Reflection ◽  
Transient Spectroscopy

ABSTRACTContactless deep level transient spectroscopy using microwave reflection at 35 GHz is presented and it is proved to be a powerful technique for characterizing trapping levels in semiconductors without the necessity of special sample preparation. The technique consists of measuring the transient decay in photoconductivity after a monochromatic light pulse has been applied to the semiconductor. The photoconductivity after the light pulse is caused by emission of carriers from trapping levels filled during the light pulse and by scanning the sample temperature it is possible to determine their activation energy. On Si-implanted layers on LEC grown SI-GaAs substrate we have detected three trapping levels, located at 0.15, 0.18 and 0.27 eV below the conduction band, by using a 1060 nm YAG laser, and one level, 0.13 eV below the conduction band, by using a 633 nm HeNe laser. The technique has been applied to LEC SI-GaAs and no trapping levels have been observed above the EL2 level.

Instrumentation for detecting channelling radiation in the high-voltage electron microscope

1983 ◽  
Vol 41 ◽  
pp. 318-319
Author(s):  
J. H. Butler ◽  
C. J. Humphreys
Keyword(s):  
Monochromatic Light ◽  
Incident Beam ◽  
Laboratory Frame ◽  
Relativistic Electrons ◽  
Voltage Electron ◽  
Dipole Emission ◽  
Sinusoidal Oscillations ◽  
Pass Through ◽  
Incident Beam Energy ◽  
Increasing Function

Electromagnetic radiation is emitted when fast (relativistic) electrons pass through crystal targets which are oriented in a preferential (channelling) direction with respect to the incident beam. In the classical sense, the electrons perform sinusoidal oscillations as they propagate through the crystal (as illustrated in Fig. 1 for the case of planar channelling). When viewed in the electron rest frame, this motion, a result of successive Bragg reflections, gives rise to familiar dipole emission. In the laboratory frame, the radiation is seen to be of a higher energy (because of the Doppler shift) and is also compressed into a narrower cone of emission (due to the relativistic “searchlight” effect). The energy and yield of this monochromatic light is a continuously increasing function of the incident beam energy and, for beam energies of 1 MeV and higher, it occurs in the x-ray and γ-ray regions of the spectrum. Consequently, much interest has been expressed in regard to the use of this phenomenon as the basis for fabricating a coherent, tunable radiation source.

REVISITING THE SOURCE MECHANISM OF THE AD 365 EARTHQUAKE CRETE, GREECE, AND IMPLICATIONS FOR EASTERN MEDITERRANEAN TECTONICS

2020 ◽  
Author(s):  
Sean Gallen ◽  
◽  
Richard Ott ◽  
Karl W. Wegmann ◽  
Frank J. Pazzaglia ◽  
...  
Keyword(s):  
Eastern Mediterranean ◽  
Source Mechanism

scholarly journals The stop-start control of seismicity by fault bends along the Main Himalayan Thrust

2021 ◽  
Vol 2 (1) ◽  
Author(s):  
Sharadha Sathiakumar ◽  
Sylvain Barbot
Keyword(s):  
Seismic Hazards ◽  
Geodetic Data ◽  
Source Mechanism ◽  
Seismogenic Zone ◽  
Seismic Cycle ◽  
Rupture Propagation ◽  
Alternative Models ◽  
Nepal Earthquake

AbstractThe Himalayan megathrust accommodates most of the relative convergence between the Indian and Eurasian plates, producing cycles of blind and surface-breaking ruptures. Elucidating the mechanics of down-dip segmentation of the seismogenic zone is key to better determine seismic hazards in the region. However, the geometry of the Himalayan megathrust and its impact on seismicity remains controversial. Here, we develop seismic cycle simulations tuned to the seismo-geodetic data of the 2015 Mw 7.8 Gorkha, Nepal earthquake to better constrain the megathrust geometry and its role on the demarcation of partial ruptures. We show that a ramp in the middle of the seismogenic zone is required to explain the termination of the coseismic rupture and the source mechanism of up-dip aftershocks consistently. Alternative models with a wide décollement can only explain the mainshock. Fault structural complexities likely play an important role in modulating the seismic cycle, in particular, the distribution of rupture sizes. Fault bends are capable of both obstructing rupture propagation as well as behave as a source of seismicity and rupture initiation.

Single shot measurement of light pulse duration by detection of excited acoustic wave

1989 ◽  
Vol 22 (10) ◽  
pp. 1423-1428 ◽  
Author(s):  
I Buchvarov ◽  
S M Saltiel ◽  
V E Gusev ◽  
V T Platonenko
Keyword(s):  
Acoustic Wave ◽  
Pulse Duration ◽  
Light Pulse ◽  
Single Shot

scholarly journals Interfacial chemical bond and internal electric field modulated Z-scheme Sv-ZnIn2S4/MoSe2 photocatalyst for efficient hydrogen evolution

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Xuehua Wang ◽  
Xianghu Wang ◽  
Jianfeng Huang ◽  
Shaoxiang Li ◽  
Alan Meng ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Electric Field ◽  
Hydrogen Evolution ◽  
Density Functional ◽  
Monochromatic Light ◽  
Density Functional Theory Calculations ◽  
Internal Electric Field ◽  
Apparent Quantum Yield ◽  
Paramagnetic Resonance ◽  
High Hydrogen

AbstractConstruction of Z-scheme heterostructure is of great significance for realizing efficient photocatalytic water splitting. However, the conscious modulation of Z-scheme charge transfer is still a great challenge. Herein, interfacial Mo-S bond and internal electric field modulated Z-scheme heterostructure composed by sulfur vacancies-rich ZnIn2S4 and MoSe2 was rationally fabricated for efficient photocatalytic hydrogen evolution. Systematic investigations reveal that Mo-S bond and internal electric field induce the Z-scheme charge transfer mechanism as confirmed by the surface photovoltage spectra, DMPO spin-trapping electron paramagnetic resonance spectra and density functional theory calculations. Under the intense synergy among the Mo-S bond, internal electric field and S-vacancies, the optimized photocatalyst exhibits high hydrogen evolution rate of 63.21 mmol∙g−1·h−1 with an apparent quantum yield of 76.48% at 420 nm monochromatic light, which is about 18.8-fold of the pristine ZIS. This work affords a useful inspiration on consciously modulating Z-scheme charge transfer by atomic-level interface control and internal electric field to signally promote the photocatalytic performance.

Source mechanism and triggered large aftershocks of the Mw 6.5 Ambon, Indonesia earthquake

2021 ◽  
Vol 799 ◽  
pp. 228709
Author(s):  
David P. Sahara ◽  
Andri D. Nugraha ◽  
Abdul Muhari ◽  
Andi Azhar Rusdin ◽  
Shindy Rosalia ◽  
...  
Keyword(s):  
Source Mechanism

scholarly journals Mouse embryonic stem cell-derived cardiomyocytes cease to beat following exposure to monochromatic light: association with increased ROS and loss of calcium transients

2019 ◽  
Vol 317 (4) ◽  
pp. C725-C736
Author(s):  
Gurbind Singh ◽  
Divya Sridharan ◽  
Mahmood Khan ◽  
Polani B. Seshagiri
Keyword(s):  
Cell Biology ◽  
Fluorescent Protein ◽  
Es Cells ◽  
Monochromatic Light ◽  
Embryonic Stem ◽  
Mouse Embryonic Stem Cell ◽  
Medical Diagnostics ◽  
Calcium Transients ◽  
Egfp Expression ◽  
Mitochondrial Activity

We earlier established the mouse embryonic stem (ES) cell “GS-2” line expressing enhanced green fluorescent protein (EGFP) and have been routinely using it to understand the molecular regulation of differentiation into cardiomyocytes. During such studies, we made a serendipitous discovery that functional cardiomyocytes derived from ES cells stopped beating when exposed to blue light. We observed a gradual cessation of contractility within a few minutes, regardless of wavelength (nm) ranges tested: blue (~420–495), green (~510–575), and red (~600–700), with green light manifesting the strongest impact. Following shifting of cultures back into the incubator (darkness), cardiac clusters regained beatings within a few hours. The observed light-induced contractility-inhibition effect was intrinsic to cardiomyocytes and not due to interference from other cell types. Also, this was not influenced by any physicochemical parameters or intracellular EGFP expression. Interestingly, the light-induced cardiomyocyte contractility inhibition was accompanied by increased intracellular reactive oxygen species (ROS), which could be abolished in the presence of N-acetylcysteine (ROS quencher). Besides, the increased intracardiomyocyte ROS levels were incidental to the inhibition of calcium transients and suppression of mitochondrial activity, both being essential for sarcomere function. To the best of our knowledge, ours is the first report to demonstrate the monochromatic light-mediated inhibition of contractions of cardiomyocytes with no apparent loss of cell viability and contractility. Our findings have implications in cardiac cell biology context in terms of 1) mechanistic insights into light impact on cardiomyocyte contraction, 2) potential use in laser beam-guided (cardiac) microsurgery, photo-optics-dependent medical diagnostics, 3) transient cessation of hearts during coronary artery bypass grafting, and 4) functional preservation of hearts for transplantation.

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