scholarly journals Determination of the imploded mass in laser-imploded shell targets

1986 ◽  
Vol 4 (3-4) ◽  
pp. 507-514 ◽  
Author(s):  
S. Denus ◽  
J. Farny ◽  
M. Grudzień ◽  
W. Mróz ◽  
J. Wołowski ◽  
...  
Keyword(s):  
Neutral Atom ◽  
Neutral Particle ◽  
Laser System ◽  
Semiconductor Diode ◽  
Velocity Spectrum ◽  
Particle Detector ◽  
Beam Laser ◽  
Atom Flux ◽  
Time Of Flight Method

A new method of experimental measurement of the imploded mass of laser-imploded shell targets is proposed. This method is based on simultaneous measurements of the velocity spectrum of the neutral atom flux emitted from the imploded part of the target, and the total energy carried by them. A semiconductor diode with a shallowly located p – n junction was used as the low energy neutral particle detector. By means of the time of flight method neutral atom fluxes with velocities υ ∼ (0·6 − 1·8) × 107cm/s were registered in experiments carried out on the 6-beam laser system “Delfin”.

Strength of the Termination Shock Inferred from the Globally Distributed Energetic Neutral Atom Flux from IBEX

2021 ◽  
Vol 254 (2) ◽  
pp. 32
Author(s):  
Bishwas L. Shrestha ◽  
Eric J. Zirnstein ◽  
Jacob Heerikhuisen ◽  
Gary P. Zank
Keyword(s):  
Neutral Atom ◽  
Termination Shock ◽  
Energetic Neutral Atom ◽  
Atom Flux ◽  
Globally Distributed

scholarly journals Laser System for Testing Early Shrinkage of Concrete Elements in Conjuction with the Deterioration of the Setting Time

2016 ◽  
Vol 16 (2) ◽  
pp. 25-34
Author(s):  
Jacek Gołaszewski ◽  
Tomasz Ponikiewski ◽  
Grzegorz Cygan ◽  
Małgorzata Gołaszewska
Keyword(s):  
Concrete Beams ◽  
Setting Time ◽  
Laser System ◽  
Scratch Resistance ◽  
Sound Waves ◽  
Concrete Elements ◽  
Speed Propagation

Abstract The paper presents a method for testing the shrinkage of concrete beams with dimensions of 10x10x50cm. Measurements followed from setting into the form until 24 hours after setting. It was used modified TLS system, which originally was meant for the determination of changes in the length of thin-mortar. Simultanously measured were the changes of speed propagation of sound waves by Vikasonic, what allows to specify the setting time of binders. It could be a base for determining the scratch resistance of the concrete in the first 24 hours after casting.

scholarly journals VARIATIONS IN THE HELIOSPHERIC POLAR ENERGETIC NEUTRAL ATOM FLUX OBSERVED BY THEINTERSTELLAR BOUNDARY EXPLORER

2012 ◽  
Vol 747 (2) ◽  
pp. 110 ◽  
Author(s):  
D. B. Reisenfeld ◽  
F. Allegrini ◽  
M. Bzowski ◽  
G. B. Crew ◽  
R. DeMajistre ◽  
...  
Keyword(s):  
Neutral Atom ◽  
Energetic Neutral Atom ◽  
Atom Flux

Determination of trapped-ion kinetic energy by the time-of-flight method for free ejected ions

1995 ◽  
Vol 51 (3) ◽  
pp. 2294-2300 ◽  
Author(s):  
M. Vedel ◽  
M. Knoop ◽  
D. Lunney ◽  
I. Rebatel ◽  
F. Vedel
Keyword(s):  
Kinetic Energy ◽  
Time Of Flight ◽  
Trapped Ion ◽  
Ion Kinetic Energy ◽  
Time Of Flight Method

Spectrographic Determination of Indium and Gallium in Cadmium Telluride Using Alumina-Cup Electrode

1969 ◽  
Vol 23 (2) ◽  
pp. 115-120 ◽  
Author(s):  
Shigeru Ohtsuka
Keyword(s):  
Cadmium Telluride ◽  
Coefficient Of Variation ◽  
Neutral Atom ◽  
Low Voltage ◽  
Approximate Determination ◽  
Spectrographic Determination ◽  
Suitable Amount ◽  
Graphite Rod

A spectrographic technique using a specially designed cup electrode is proposed for the determination of indium and gallium in a solution of cadmium telluride. The electrode consists of an alumina cup which serves as a reservoir for the sample and a central tungsten rod supporting a graphite rod. It allows the excitation under low voltage over damped discharge. The method is especially useful for analysis of small quantities of material. The addition of a suitable amount of lithium has been found to enhance the intensity of the neutral atom lines of indium and gallium. Approximate determination limits for indium and gallium are 0.5 μg/ml, and the coefficient of variation for the determination is about 6% at the 5 μg/ml level.

Evaluation of Femtosecond Laser-Induced Breakdown Spectroscopy for Analysis of Animal Tissues

2008 ◽  
Vol 62 (10) ◽  
pp. 1137-1143 ◽  
Author(s):  
Dário Santos ◽  
Ricardo Elgul Samad ◽  
Lílian Cristina Trevizan ◽  
Anderson Zanardi de Freitas ◽  
Nilson Dias Vieira ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Certified Reference Materials ◽  
Laser System ◽  
Laser Induced Breakdown Spectroscopy ◽  
Animal Tissues ◽  
Time Resolved ◽  
Breakdown Spectroscopy ◽  
Laser Induced Breakdown ◽  
Intensified Charge Coupled Device

The aim of this work was to evaluate the performance of femtosecond laser-induced breakdown spectroscopy (fs-LIBS) for the determination of elements in animal tissues. Sample pellets were prepared from certified reference materials, such as liver, kidney, muscle, hepatopancreas, and oyster, after cryogenic grinding assisted homogenization. Individual samples were placed in a two-axis computer-controlled translation stage that moved in the plane orthogonal to a beam originating from a Ti:Sapphire chirped-pulse amplification (CPA) laser system operating at 800 nm and producing a train of 840 μJ and 40 fs pulses at 90 Hz. The plasma emission was coupled into the optical fiber of a high-resolution intensified charge-coupled device (ICCD)–echelle spectrometer. Time-resolved characteristics of the laser-produced plasmas showed that the best results were obtained with delay times between 80 and 120 ns. Data obtained indicate both that it is a matrix-independent sampling process and that fs-LIBS can be used for the determination of Ca, Cu, Fe, K, Mg, Na, and P, but efforts must be made to obtain more appropriate detection limits for Al, Sr, and Zn.

Determination of the interface δ-hole density in a blue-emitting organic semiconductor diode by electromodulated absorption spectroscopy

2010 ◽  
Vol 97 (11) ◽  
pp. 113505 ◽  
Author(s):  
Mi Zhou ◽  
Rui-Qi Png ◽  
Sankaran Sivaramakrishnan ◽  
Perq-Jon Chia ◽  
Chaw-Keong Yong ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
Organic Semiconductor ◽  
Semiconductor Diode ◽  
Hole Density
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