Excited Electronic and Vibrational State Decomposition of Energetic Materials and Model Systems on Both Nanosecond and Femtosecond Time Scales

2014 ◽  
Author(s):  
Elliot R. Bernstein
Keyword(s):  
Time Scales ◽  
Energetic Materials ◽  
Vibrational State ◽  
Model Systems

On the excited electronic state dissociation of nitramine energetic materials and model systems

2007 ◽  
Vol 127 (15) ◽  
pp. 154301 ◽  
Author(s):  
Y. Q. Guo ◽  
M. Greenfield ◽  
A. Bhattacharya ◽  
E. R. Bernstein
Keyword(s):  
Electronic State ◽  
Energetic Materials ◽  
Excited Electronic State ◽  
Model Systems ◽  
State Dissociation

Rectify the effect of measurement in survival probability of the ground vibrational state in diatomic molecule

2019 ◽  
Vol 33 (17) ◽  
pp. 1950177
Author(s):  
Bikram Nath ◽  
Sariful Rahaman ◽  
Chandan Kumar Mondal
Keyword(s):  
Survival Probability ◽  
Quantum Dynamics ◽  
Vibrational State ◽  
Repeated Measurements ◽  
Model Systems ◽  
Secondary Field ◽  
Ground Vibrational State ◽  
Zeno Effect ◽  
Secondary Recovery ◽  
Time Gap

We have proposed a methodology that uses secondary electromagnetic field to overcome the effect of measurement on quantum dynamics. Our aim is also to find out some characteristics of the used secondary (recovery) field. We have applied the methodology to reduce the quantum Zeno effect (ZE), a consequence of repeated measurements in survival probability of ground vibrational state. As the model systems, we choose HBr[Formula: see text] and HI. The study is done with variation in frequency, pulse shape and other parameters of the secondary field. In all cases, suitable secondary field for which the Zeno effect is minimum is found near 0 [Formula: see text] 1 vibrational transition frequency. Suitable time gap between the measurement and the application of secondary field depends on the shape of the secondary field. When the secondary field is optimized, the recovery is more than 90% which almost nullify the Zeno effect.

Experiments Probing Fundamental Mechanisms of Energetic Material Initiation and Ignition

2012 ◽  
Vol 1405 ◽  
Author(s):  
Christopher M. Berg ◽  
Kathryn E. Brown ◽  
Rusty W. Conner ◽  
Yuanxi Fu ◽  
Hiroki Fujiwara ◽  
...  
Keyword(s):  
Shock Waves ◽  
Shock Front ◽  
Time Scales ◽  
Vibrational Spectroscopy ◽  
Shock Compression ◽  
Energetic Materials ◽  
Emission Spectroscopy ◽  
Energetic Material ◽  
Thick Layers

ABSTRACTTwo fundamental processes associated with shock compression of energetic materials (EM) are initiation and ignition. Initiation occurs just behind a shock front and ignition occurs anywhere from a few nanoseconds to hundreds of nanoseconds later. Experiments are described that probe the fundamental mechanisms of these processes on relevant length and time scales: picosecond vibrational spectroscopy of nanometer thick layers of energetic materials (EM) with laser-driven shock waves, and nanosecond emission spectroscopy of micrometer thick layers of EM using laser-driven flyer plates.

The Atomistic Spin Dynamics Equation of Motion

2017 ◽  
Author(s):  
Olle Eriksson ◽  
Anders Bergman ◽  
Lars Bergqvist ◽  
Johan Hellsvik
Keyword(s):  
Master Equation ◽  
Time Scales ◽  
Spin Dynamics ◽  
Magnetic Moments ◽  
Equation Of Motion ◽  
Model Systems ◽  
Magnetization Dynamics ◽  
Heisenberg Exchange ◽  
Exchange Parameters

From the information obtained in DFT, in particular the magnetic moments and the Heisenberg exchange parameters, one has the possibility to make a connection to atomistic spin-dynamics. In this chapter the essential features of this connection is described. It is also discussed under what length and time-scales that this approach is a relevant approximation. The master equation of atomistic spin-dynamics is derived, and discussed in detail. In addition we give examples of how this equation describes the magnetization dynamics of a few model systems.

Nuclear coiled bodies and the nucleolus

1994 ◽  
Vol 52 ◽  
pp. 20-21
Author(s):  
K. Brasch ◽  
J. Williams ◽  
D. Gallo ◽  
T. Lee ◽  
R. L. Ochs
Keyword(s):  
Mouse Liver ◽  
Nuclear Body ◽  
Nuclear Bodies ◽  
Model Systems ◽  
Coiled Body ◽  
Rrna Processing ◽  
Malignant Cells ◽  
Sm Proteins ◽  
Coiled Bodies ◽  
Unique Protein

Though first described in 1903 by Ramon-y-Cajal as silver-staining “accessory bodies” to nucleoli, nuclear bodies were subsequently rediscovered by electron microscopy about 30 years ago. Nuclear bodies are ubiquitous, but seem most abundant in hyperactive and malignant cells. The best studied type of nuclear body is the coiled body (CB), so termed due to characteristic morphology and content of a unique protein, p80-coilin (Fig.1). While no specific functions have as yet been assigned to CBs, they contain spliceosome snRNAs and proteins, and also the nucleolar protein fibrillarin. In addition, there is mounting evidence that CBs arise from or are generated near the nucleolus and then migrate into the nucleoplasm. This suggests that as yet undefined links may exist, between nucleolar pre-rRNA processing events and the spliceosome-associated Sm proteins in CBs.We are examining CB and nucleolar changes in three diverse model systems: (1) estrogen stimulated chick liver, (2) normal and neoplastic cells, and (3) polyploid mouse liver.

Microtubule Dynamics and Organelle Transport in Reticulomyxa

1990 ◽  
Vol 48 (3) ◽  
pp. 194-195
Author(s):  
Yih-Tai Chen ◽  
Ursula Euteneuer ◽  
Ken B. Johnson ◽  
Michael P. Koonce ◽  
Manfred Schliwa
Keyword(s):  
Plasma Membrane ◽  
Light Microscopy ◽  
Cytoplasmic Dynein ◽  
Living Cells ◽  
Microtubule Dynamics ◽  
Model Systems ◽  
Organelle Transport ◽  
Biochemical Characteristics ◽  
Dependent Transport

The application of video techniques to light microscopy and the development of motility assays in reactivated or reconstituted model systems rapidly advanced our understanding of the mechanism of organelle transport and microtubule dynamics in living cells. Two microtubule-based motors have been identified that are good candidates for motors that drive organelle transport: kinesin, a plus end-directed motor, and cytoplasmic dynein, which is minus end-directed. However, the evidence that they do in fact function as organelle motors is still indirect.We are studying microtubule-dependent transport and dynamics in the giant amoeba, Reticulomyxa. This cell extends filamentous strands backed by an extensive array of microtubules along which organelles move bidirectionally at up to 20 μm/sec (Fig. 1). Following removal of the plasma membrane with a mild detergent, organelle transport can be reactivated by the addition of ATP (1). The physiological, pharmacological and biochemical characteristics show the motor to be a cytoplasmic form of dynein (2).

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