Results 211 to 220 of about 291,117 (255)
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Fluorescent resonant excitation energy transfer in linear polyenes
The Journal of Chemical Physics, 2010We have studied the dynamics of excitation transfer between two conjugated polyene molecules whose intermolecular separation is comparable to the molecular dimensions. We have employed a correlated electron model that includes both the charge-charge, charge-bond, and bond-bond intermolecular electron repulsion integrals.
Das, Mousumi +1 more
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Linear Energy Transfer and Track Structure
1993Publisher Summary This chapter discusses track structures and linear energy transfer. There are two types of energy dissipation of heavy ions—nuclear and electronic stopping. Nuclear stopping has high RBE values and predominates at extremely low specific energies of a few kiloelectronvolts per mass unit, corresponding to the last micrometers of the ...
Gerhard Kraft, Michael KrÄMer
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Controlling energy and charge transfer in linear chlorophyll dimers
Chemical Communications, 2007A series of linkers constructed from combinations of phenyl and ethynyl groups is shown to permit ultrafast energy transfer between two chlorophylls, while allowing control over radical cation migration between them.
Richard F, Kelley +3 more
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Comments on radiation dosimetry and linear energy transfer
Sozial- und Pr�ventivmedizin SPM, 1991The quantification of the physical effects of ionizing radiation in human tissue is the basis of risk assessment. This quantification results from determination of kerma or absorbed dose. The procedure for the absolute determination of absorbed dose with an ionization chamber is discussed. The biological effects of ionizing radiation are dependent, not
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Measurements of Neutron Dose as a Function of Linear Energy Transfer
Radiation Research, 1955Recent developments in radiobiology have created a need for a more detailed description of physical exposure conditions. In particular, the relative biological effectiveness (RBE) is believed to be related to the linear energy transfer (LET) (1) of the charged particles traversing irradiated tissues. In fact, permissible exposure to ionizing radiations
H H, ROSSI, W, ROSENZWEIG
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A Spatially Restricted Linear Energy Transfer Equation
Radiation Research, 1992An analytical expression is developed for calculating the average energy deposited by an ion in a volume with dimensions less than the range of the secondary electrons produced. The expression is obtained by including two additional terms in an energy-restricted linear-energy-transfer equation. The usual energy-restricted expression accounts for energy
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Analytical linear energy transfer calculations for proton therapy
Medical Physics, 2003As the relative biological effectiveness of protons depends on the linear energy transfer (LET), simple methods for LET calculations are desired for the optimization of proton therapy. This work provides an analytical model for the LET on the central axis of broad proton beams in water, which can also be applied to spread-out Bragg peaks. For realistic
Jan J, Wilkens, Uwe, Oelfke
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Non-linear dynamics and energy transfer
Journal of Molecular Structure, 1986Abstract Non-linear dynamics is mostly concerned with coupled anharmonic oscillators, a common situation in the classical description of molecule dynamics. Non-linear systems are in general not integrable, but for small enough energy or couplings most trajectories are quasiperiodic (KAM theorem).
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Modeling Framework for Contactless Energy Transfer Systems for Linear Actuators
IEEE Transactions on Industrial Electronics, 2013This paper presents a semi-analytical modeling framework to evaluate the performance of a contactless energy transfer system which consists of multiple primary windings and a linear moving secondary winding. The modeling framework combines steady-state and electromagnetic analysis and is able to deal with different winding configurations, consisting of
J. P. C. Smeets +3 more
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A Linear Energy Transfer Effect in the Radiolysis of Cyclohexane
Nature, 1964PREVIOUS experiments1,2 with aliphatic hydrocarbons have shown little dependence of product yields on the type or incident radiation over the range of linear energy transfer (LET) used, although substantial variations have been reported for aromatic3,4 and unsaturated5 substances.
W. G. BURNS, J. R. PARRY
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