Effect of frequency detuning and the character of the modulating function on the formation of very short pulses in a laser with stimulated (forced) synchronization of the modes

1976 ◽  
Vol 24 (2) ◽  
pp. 163-168
Author(s):  
R. G. Zaporozhchenko ◽  
V. A. Zaporozhchenko ◽  
N. G. Kondrashov
Keyword(s):  
Frequency Detuning ◽  
Short Pulses ◽  
Very Short Pulses

scholarly journals LOCALIZATION OF MACROMOLECULES IN ESCHERICHIA COLI

1961 ◽  
Vol 9 (3) ◽  
pp. 539-553 ◽  
Author(s):  
Lucien G. Caro
Keyword(s):  
Escherichia Coli ◽  
Poisson Distribution ◽  
Cross Sections ◽  
Morphological Changes ◽  
Nuclear Region ◽  
High Concentration ◽  
Short Pulses ◽  
Thin Sections ◽  
Change Concerns ◽  
Very Short Pulses

If thin sections of Escherichia coli, labeled uniformly with tritium, are radioautographed calculations, based on the distribution of section sizes show that the number of H3 decays per section should be very close to a Poisson distribution. We might, therefore, expect that the distribution of radioautographic grain counts among random cross-sections should follow a Poisson distribution. It can then be inferred that a deviation from a Poisson indicates a high concentration of label in a preferred region. This region can then be identified by analysis of serial section and comparison with electron micrographs. Sections of cells labeled with leucine-H3 gave a Poisson distribution of grain counts, and it was concluded that proteins were distributed fairly uniformly throughout the cell. The situation was not changed if labeled cells were placed in chloramphenicol or if very short pulses of label were used. When Escherichia coli is grown in presence of chloramphenicol a major morphological change concerns the nuclear region: it becomes more regular in outline, nearly spherical, and occupies a smaller proportion of the cell length. The previously described association between DNA labeled with thymidine-H3 and the nuclear region was confirmed by showing that the distribution of the label in the cell followed exactly the morphological changes of the nuclear region. It was also shown that the concentration of DNA in the nuclear region was at least 45 times higher than that of the cytoplasm. Several morphological features of cells grown in chloramphenicol and examined in the electron microscope are discussed.

The response of 741 op amps to very short pulses

1980 ◽  
Vol 15 (5) ◽  
pp. 908-910 ◽  
Author(s):  
V.G. Ruediger ◽  
B.J. Hosticka
Keyword(s):  
Short Pulses ◽  
Op Amps ◽  
Very Short Pulses

Theoretical estimation of the cavitation threshold for very short pulses of ultrasound

Ultrasonics ◽  
1991 ◽  
Vol 29 (5) ◽  
pp. 376-380 ◽  
Author(s):  
J. Šponer
Keyword(s):  
Theoretical Estimation ◽  
Short Pulses ◽  
Cavitation Threshold ◽  
Very Short Pulses

The Influence of Laser Drilling Process on the Microstructural Changes of Nickel Based Superalloy

2018 ◽  
Vol 1146 ◽  
pp. 134-141
Author(s):  
Sanja Petronić ◽  
Andjelka Milosavljevic ◽  
Meri Burzić ◽  
Olivera Eric-Cekic ◽  
Suzana Polic ◽  
...  
Keyword(s):  
Heat Affected Zone ◽  
Laser Drilling ◽  
Drilling Process ◽  
Short Pulses ◽  
Microstructural Changes ◽  
Geometrical Characteristics ◽  
Nickel Based Superalloy ◽  
Nd:Yag Lasers ◽  
Corrosion And Oxidation ◽  
Very Short Pulses

Nimonic 263 is an alloy with superior mechanical strength and creep resistance at high temperatures and pressure, good formability, and corrosion and oxidation resistance. Due to their high beam density and very short pulses which reduces the heat affected zone (HAZ) Nd:YAG lasers are very suitable for materials drilling. In this paper, the Nimonic 263 sheets, thickness of 2 mm, are laser drilled with various parameters. The influence of laser drilling process on microstructural changes along with the geometrical characteristics are analysed and discussed.

Interplay of Soret vs. Normal Impurity Diffusion During Laser or E-Beam Induced Heat Flow Transients in Metals

1981 ◽  
Vol 4 ◽  
Author(s):  
L.F. Dona' Dalle Rose ◽  
A. Miotello
Keyword(s):  
Experimental Data ◽  
Electron Beam ◽  
Heat Flow ◽  
Diffusion Processes ◽  
Soret Effect ◽  
Energy Sources ◽  
Metal Sample ◽  
Short Pulses ◽  
Thermal Transient ◽  
Very Short Pulses

ABSTRACTIn the growing amount of the experimental data on the diffu sion processes of implanted impurities in a metal sample irradiated by highly energetic and very short pulses, some order may be introduced by the knowledge of the structure of induced thermal transient. The differences in such a structure due to two different energy sources (laser and electron beam) are de scribed with reference to the conditions under which Soret diffusion may be experimentally observed as distinct from nor mal diffusion. Laser induced transient seem to offer this possibility.Some previously reported diffusion processes in laser irra diated systems are reinterpreted on this basis, showing the importance of the Soret effect.

Generation of very short pulses

1946 ◽  
Vol 93 (1) ◽  
pp. 314-315
Author(s):  
D.C. Espley
Keyword(s):  
Short Pulses ◽  
Very Short Pulses
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