46,314 research outputs found
A new mathematical model for radiation cell killing mechanism: Target cumulating model
There are numerous mathematical or statistical models have been given out for radiation cell killing mechanism. Unfortunately, none of the model could explain the mechanism perfectly. The more advanced model for it is still necessary to be researched. Following common assumption, a new theoretical model named "target cumulating" model is induced from the molecular and particle physics level. The result of theoretical calculation gives the equation of cell survival rate corresponding to delivered dose and other sensitivity parameters. In addition to fit the cell survival curve well, the new model showed advantages with comparing to previous models. Also, the new model predicts or explains some phenomenon that had been observed in laboratory (e.g. dose rate effect and low dose hypersensitivity)
OSU Multimodal Machine Translation System Report
This paper describes Oregon State University's submissions to the shared
WMT'17 task "multimodal translation task I". In this task, all the sentence
pairs are image captions in different languages. The key difference between
this task and conventional machine translation is that we have corresponding
images as additional information for each sentence pair. In this paper, we
introduce a simple but effective system which takes an image shared between
different languages, feeding it into the both encoding and decoding side. We
report our system's performance for English-French and English-German with
Flickr30K (in-domain) and MSCOCO (out-of-domain) datasets. Our system achieves
the best performance in TER for English-German for MSCOCO dataset.Comment: 5, WMT 201
Spin-orbit and orbit-orbit strengths for radioactive neutron-rich doubly magic nucleus Sn in relativistic mean field theory
Relativistic mean field (RMF) theory is applied to investigate the properties
of the radioactive neutron-rich doubly magic nucleus Sn and the
corresponding isotopes and isotones. The two-neutron and two-proton separation
energies are well reproduced by the RMF theory. In particular, the RMF results
agree with the experimental single-particle spectrum in Sn as well as
the Nilsson spin-orbit parameter and orbit-orbit parameter thus
extracted, but remarkably differ from the traditional Nilsson parameters.
Furthermore, the present results provide a guideline for the isospin dependence
of the Nilsson parameters.Comment: 4 pages, 4 figures, Phys. Rev. C in pres
Spectral properties of photon pairs generated by spontaneous four wave mixing in inhomogeneous photonic crystal fibers
The photonic crystal fiber (PCF) is one of the excellent media for generating
photon pairs via spontaneous four wave mixing. Here we study how the
inhomogeneity of PCFs affect the spectral properties of photon pairs from both
the theoretical and experimental aspects. The theoretical model shows that the
photon pairs born in different place of the inhomogeneous PCF are coherently
superposed, and a modulation in the broadened spectrum of phase matching
function will appear, which prevents the realization of spectral factorable
photon pairs. In particular, the inhomogeneity induced modulation can be
examined by measuring the spectrum of individual signal or idler field when the
asymmetric group velocity matching is approximately fulfilled. Our experiments
are performed by tailoring the spectrum of pulsed pump to satisfy the specified
phase matching condition. The observed spectra of individual signal photons,
which are produced from different segments of the 1.9 m inhomogeneous PCF,
agree with the theoretical predictions. The investigations are not only useful
for fiber based quantum state engineering, but also provide a dependable method
to test the homogeneity of PCF.Comment: to appear in Phys. Rev.
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